Full opinion text
TJOFLAT, Circuit Judge: This is a case of almost all doctors versus almost all major health maintenance organizations (HMOs), coming before us for the third time in as many years; there have been twenty-one published orders and opinions in this case from various federal courts. The plaintiffs are a putative class of all doctors who submitted at least one claim to any of the defendant HMOs between 1990 and 2002. They allege that the defendants conspired with each other to program their computer systems to systematically underpay physicians for their services. We affirm the district court’s certification of the plaintiffs’ federal claims, though we strongly urge the district court to revisit the definition of these classes, and reverse the district court’s certification of the plaintiffs’ state claims. We do not reach the district court’s certification of a California Subclass since the defendants did not specifically challenge the certification on appeal. I. The plaintiffs are physicians who were reimbursed by one or more of the defendant HMOs for treating patients covered by those HMOs. The plaintiffs allege that the backbone of their relationship with the HMOs is that they “will be paid, in a timely manner, for the covered, medically necessary services they render.” Provider Plaintiffs’ Second Amended, Consolidated Class Action Complaint, ¶4 (Sept. 19, 2002) (hereinafter, Second Complaint). In a phrase that will undoubtedly play well with a jury, the doctors alliteratively claim that the defendants systematically “deny, delay and diminish the payments due to [them],” id. ¶ 5, and fail to tell doctors that they are being underpaid, id. ¶ 78. The complaint alleges that the defendants’ reimbursement system is based on covertly denying payments to physicians based on financially expedient cost and actuarial criteria rather than medical necessity, processing physicians’ bills using automated programs which manipulate standard coding practices to artificially reduce the amount they are paid, and ... systematically delaying payments to gain increased use of the physicians’ funds. Id. ¶ 6. If an agreement between a physician and an HMO exists, its terms govern the physician’s reimbursement. The HMOs also “represent to the medical profession at large” that when a physician treats a patient who belongs to an HMO with which the physician does not have a contract, the HMO will still reimburse him. Among the ways in which the defendants allegedly convey this information are “[b]y disseminating billing information to the profession at large,” “confirming coverage for medically necessary services when contacted by doctors prior to treatment,” and “explaining payments so as to make it appear that doctors are being paid for the covered, medically necessary services they render.” Id. ¶¶ 77(c), (d), (f). The complaint alleges that physicians under contract with HMOs are compensated through one of two different methods— fee-for-service or capitation. Physicians who do not have a contractual relationship with an HMO are reimbursed only under a fee-for-service regime. See id. ¶¶ 79, 101. Although the plaintiffs allege that they are being systematically underpaid under both payment methods, the exact ways in which this is purportedly accomplished differ; we will consider each reimbursement scheme in turn. A. Under a fee-for-service plan, an HMO agrees to reimburse doctors for any medically necessary services they perform on covered individuals, whether or not those doctors are under contract with the HMO. This gives doctors an incentive to perform as many tests and procedures as they can convince the HMO are medically necessary; HMOs, in contrast, have an incentive to approve as few procedures as possible. Both parties claim they are acting in their patients’ best medical interests. To claim reimbursement, physicians are required to fill out an HCFA-1500 form, developed by the federal government and the American Medical Association. These forms employ a “current procedural terminology” coding procedure (“CPT coding”) whereby medical procedures are identified by standardized designators. Each designator is comprised of two components: a “base code” that identifies the nature of the procedure and a series of modifiers “for the degree of difficulty, complexity and multiplicity.” Id. ¶ 80. Each HCFA-1500 form is processed by the defendants’ computer systems, which specify the amount that the physician should be paid. The plaintiffs allege that these computer systems are programmed to systematically underpay the plaintiffs through a variety of methods. First, the plaintiffs allege that the systems are programmed to simply deny reimbursement for certain base codes that insurance companies feel are too expensive, notwithstanding their contractual obligations to both physicians and patients. Id. ¶ 84. Second, the plaintiffs allege that when the systems read certain base codes on HCFA-1500 forms, they are programmed to interpret them as requesting reimbursement for less expensive procedures (“downcoding”). Id. ¶ 86. Third, the plaintiffs contend that the system is programmed to simply group certain base codes together, so that if the system reads certain combinations of codes on the forms, they will be interpreted as being only a single code (“grouping”). Id. Fourth, the system is allegedly programmed to ignore certain modifiers that would drive up physicians’ reimbursements. Id. ¶ 90. Fifth, the plaintiffs assert that the system is designed to unnecessarily put their reimbursement claims in a “state of suspense before they are processed even though no additional information is needed or requested.... The end result is that average payment times exceed by multiples the time provided for by law in most states as well as the time set by contract and industry practice.” Id. ¶¶ 94, 96. Finally, the plaintiffs allege that the forms the HMOs send to physicians explaining the amounts of their reimbursements, called “explanation of benefits” forms (“EOBs”), “misrepresent or conceal the actual manner in which Plaintiffs’ ... payment requests were processed so as to induce them to accept reduced payments in reliance thereon.” Id. ¶ 98. B. Even plaintiffs whose contracts establish a capitation payment plan are not free from the defendants’ alleged manipulation. Under a capitation agreement, each patient specifies a physician as his “primary care provider.” The HMO is obligated to pay each physician a small monthly fee, called a capitation payment, for each patient registered to him. The physician, in turn, is obligated to provide whatever medical services each registered patient requires. Thus, a capitation system is a flat-rate scheme in which a physician’s payments are “based on the number of patients they agree to treat rather than on the services they actually render.” Id. ¶ 7. A capitation method gives a physician an incentive to provide as few services as possible to each patient, whether or not medically necessary, because his payments are not tied to the quality or extent of services he provides. The HMOs, in turn, have an incentive to register as few patients as possible with each physician, so as to reduce their monthly per-patient outlays. The plaintiffs contend that the HMOs are underpaying physicians by failing to pay capitation fees for many patients who have registered with a physician but never visited him. Id. ¶ 105. Consequently, plaintiffs allege, they are receiving capitation payments based on a much smaller pool of patients than that to which they are entitled. This is not the only way in which the defendants have allegedly cheated doctors reimbursed under a capitation scheme. Before sending physicians their capitation payments, HMOs withhold a small amount of money to establish a “pharmacy risk pool,” which is used to pay for their insured patients’ medication. The plaintiffs contend that the defendants are withholding too much from their capitation reimbursements because they are basing the withholdings on the actual cost of the drugs the patients are using, without taking into account “the substantial rebates/refunds/discounts granted by drug manufacturers.” Id. ¶ 106. The defendants are also contractually obligated to pay the plaintiffs an extra bonus if there is money left in the pharmaceutical risk fund at the end of the year after all of the patients’ covered medications have been paid for. The plaintiffs allege, however, that defendants somehow “adjust” the year-end statements for the risk fund so as to avoid making these payments. Id. ¶ 107. Finally, not all services are covered by the capitation plan; for certain non-covered services, physicians are required to submit HCFA-1500 forms. The plaintiffs allege that when capitation-plan doctors submit these forms, they are subjected to the same types of fraudulent behavior as the fee-for-service doctors, discussed in the previous Section. C. The plaintiffs sued a variety of large HMOs because they claim that these practices are not occurring in isolation, but are instead the end-product of a decades-long nefarious conspiracy to undermine the American health care system. The plaintiffs assert that such a conspiracy was necessary to permit these practices to continue, because “[i]f only one Defendant engaged in these activities, physicians could and would refuse to do business with that Defendant, but together Defendants have the power and influence necessary to affect and perpetuate their scheme.” Id. ¶ 118. To support this allegation, the plaintiffs point to the fact that most of the HMOs run their reimbursement processes in substantially the same way, id. ¶ 119, and participate in various industry groups, trade associations, and standards-promulgation projects, id. ¶ 120. D. This case originated when lawsuits were filed in four federal judicial districts against Humana, Inc., for underpaying doctors in the manners described above. These suits were consolidated by the Judicial Panel on Multidistrict Litigation (the “Panel”) in the Southern District of Florida. In re Humana Managed Care Litig., No. 1334, 2000 WL 34325806, 2000 U.S. Dist. LEXIS 5099 (J.P.M.L. Apr. 28, 2000). Later, the Panel decided to combine the suits against Humana with several other similar federal suits from across the country filed against other major HMOs. In re Humana Managed Care Litig., Nos. 1334, 1364, 1366 & 1367, 2000 WL 1925080, 2000 U.S. Dist. LEXIS 15927 (J.P.M.L. Oct. 23, 2000). The Panel found that these suits “involvefd] common questions of fact concerning whether defendants — either singly or as part of a conspiracy — implemented certain policies, including inter alia utilization review processes, physician financial incentives, and/or failure to pay clean claims in a timely manner which ... unlawfully interfered with health care providers’ delivery of ... care.” Id. at *2, 2000 U.S. Dist. LEXIS 15927 at *7-8. It further held, Centralization of all the actions under Section 1407 in the Southern District of Florida ... will serve the convenience of the parties and witnesses and promote the just and efficient conduct of this litigation. Congregating all these actions there is necessary in order to avoid duplication of discovery, prevent inconsistent or repetitive pretrial rulings, and conserve the resources of the parties, their counsel and the judiciary. As a result, resolution of overlapping issues, such as class certification, any common practices, and the nature and existence of any conspiracy, will be streamlined. Id. at *2, 2000 U.S. Dist. LEXIS 15927 at *8. Separate federal proceedings against CIGNA were later consolidated into this suit in In re Managed Care Litig., 246 F.Supp.2d 1363, 1364 (J.P.M.L.2003). Once the cases were consolidated, the plaintiffs filed an amended complaint against all of the defendants, see First Consolidated, Amended Class Action Complaint (Mar. 26, 2001) (hereinafter, First Complaint). It requested that the district court certify three classes. First, the plaintiffs requested certification of a Global Class, including “[a]ll medical doctors who provided services to any person insured by any defendant from August 14, 1990 to [the date of certification],” to pursue their claims that the defendants conspired to violate the Racketeer Influenced and Corrupt Organizations Act (RICO), and aided and abetted each other in doing so. Id. ¶ 119 (brackets in original). Second, the plaintiffs sought recognition of a National Subclass, comprised of all “[m]edical doctors who provided services to any person insured by a Defendant, when the doctor has a claim against such Defendant and is not bound to arbitrate the claim,” to pursue various state-law claims against the defendants, as well as claims based on “direct” (substantive, as opposed to inchoate) RICO violations. Id. ¶ 120. Finally, the plaintiffs requested certification of a California Subclass, comprised of “[m]edical doctors who provided services to any person insured in California by any defendant, when the doctor was not bound to arbitrate the claim being asserted,” to pursue alleged violations of Cal. Bus. & Prof. Code § 17200. Id. ¶ 121. The district court certified all three classes, In re Managed Care Litig., 209 F.R.D. 678 (S.D.Fla.2002), and the HMOs now appeal. For a district court to certify a class action, the named plaintiffs must have standing, and the putative class must meet each of the requirements specified in Federal Rule of Civil Procedure 23(a), as well as at least one of the requirements set forth in Rule 23(b). City of Hialeah v. Rojas, 311 F.3d 1096, 1101 (11th Cir.2002); Turner v. Beneficial Corp., 242 F.3d 1023, 1025 (11th Cir.2001). The classes in this case were certified under Rule 23(b)(3), which states that a class action may be certified if “the court finds that the questions of law or fact common to the members of the class predominate over any questions affecting only individual members, and that a class action is superior to other available methods for the fair and efficient adjudication of the controversy.” In this appeal, the defendants do not challenge the standing of the named plaintiffs or any of the district court’s findings concerning Rule 23(a); they contend only that certification under Rule 23(b)(3) was improper. They raise three separate arguments. First, they contend that common questions of law and fact concerning the federal claims do not predominate over individual issues specific to each plaintiff. They next make the same argument regarding the plaintiffs’ state law claims. Finally, for both the federal and state claims, they contend that, regardless of whether common issues of law and fact predominate, a class action is inferior to other methods of adjudicating them. We address each of these arguments in separate Parts. “The decision to certify is within the broad discretion of the district court....” Castano v. Am. Tobacco Co., 84 F.3d 734, 740 (5th Cir.1996). However, with great power comes great responsibility; the awesome power of a district court must be “exercised within the framework of rule 23.” Id. We apply an abuse of discretion standard in reviewing the district court’s class certification rulings. Hines v. Widnall, 334 F.3d 1253, 1255 (11th Cir.2003). A district court abuses its discretion if it applies an incorrect legal standard, follows improper procedures in making the determination, or makes findings of fact that are clearly erroneous. A district court may also abuse its discretion by applying the law in an unreasonable or incorrect manner. Finally, an abuse of discretion occurs if the district court imposes some harm, disadvantage, or restriction upon someone that is unnecessarily broad or does not result in any offsetting gain to anyone else or society at large. In making these assessments, we review the district court’s factual determinations for clear error, and its purely legal determinations de novo. Klay v. United Healthgroup, Inc., 376 F.3d 1092, 1096 (11th Cir.2004) (quotation marks and citations omitted). II. The defendants’ first claim is that the district court erred in certifying a Global Class to pursue federal RICO claims based on conspiracy and aiding-and-abetting, and a National Class to pursue federal claims based on “direct” RICO violations, because the common issues of fact and law these claims involve do not predominate over individualized issues. Section A explains the substance of the plaintiffs’ RICO claims in order to determine the issues of fact and law that are implicated. Section B analyzes our circuit’s precedents concerning whether common issues of fact and law predominate over individualized ones under Rule 23(b)(3). Section C applies these principles to the RICO claims in this case, concluding that the district court did not abuse its discretion in certifying classes to litigate these claims. Finally, although we conclude that the district court acted within the proper scope of its power, Section D offers an observation that we strongly urge the court to consider in potentially redefining the scope of these classes. A. To understand the plaintiffs’ RICO claims, it is necessary to first examine two of the central elements upon which they are predicated — the “pattern of racketeering activity” in which the defendants allegedly engaged, and the “enterprise” to which this racketeering activity was allegedly related. To violate RICO, a defendant must engage in a pattern of racketeering activities. RICO designates the violation of certain federal criminal laws as “racketeering activities,” see 18 U.S.C. § 1961(1). The plaintiffs contend that the defendants committed racketeering activities by engaging in mail and wire fraud, in violation of 18 U.S.C. §§ 1341 and 1343; extortion, in violation of 18 U.S.C. §§ 1951(a) and (b)(2); and violations of the Travel Act, 18 U.S.C. § 1952(a)(3). The defendants allegedly committed mail and wire fraud by withholding from the plaintiffs information concerning the various practices described above in Sections I.A and I.B. For example, the plaintiffs allege that the “Defendants misrepresented to Plaintiffs and class members that Defendants would pay Plaintiffs and class members for medically necessary services and procedures according to the CPT codes for the services and procedures they provided.” First Complaint ¶ 236. The plaintiffs further contend that the defendants “have concealed and have failed to disclose that they deliberately delay payments ... [and] that they have developed or purchased claims systems designed to manipulate CPT codes.” Id. ¶ 239, 241. Regarding doctors reimbursed under a capitation plan, the plaintiffs maintain that the defendants “have represented that capitation payments are paid upon enrollment of members [and] ... have failed to disclose their use of age/sex adjustment factors to adjust capitation payments below the levels the Defendants agreed to pay.” M ¶¶ 245^16. The defendants allegedly engaged in extortion by forcing] Plaintiffs and members of the class to accept capitation contracts, accept the loss of compensation for treating Defendants’ insureds which results from their misrepresentation and manipulation of the workings of the capitation payment system, and accept the denial, reduction and delay of payments for covered, medically necessary services ... through fear of economic loss. Defendants create this fear through threats, both veiled and explicit, that doctors will lose the patient base Defendants control, be blacklisted, and in the case of noncon-tract doctors, not be paid at all. Third Amended, Consolidated Class Action Complaint ¶¶ 150-51 (Nov. 25, 2002) (hereinafter, Third Complaint). The final racketeering activity in which the defendants allegedly engaged was violating the Travel Act, which makes it a crime to “travel[ ] in interstate or foreign commerce or use[ ] the mail or any facility in interstate or foreign commerce, with intent to ... promote, manage, establish, carry on or facilitate the promotion, management, establishment, or carrying on, of any unlawful activity.” 18 U.S.C. § 1952(a)(3). The defendants purportedly used “the mail or other facilities of interstate commerce ... to carry on their extortion” as described above. Third Complaint ¶ 154. Having laid out the various racketeering activities in which the defendants allegedly engaged, we now turn to the enterprise to which these activities were ostensibly related. The plaintiffs assert that the defendants belonged to a shadowy, mysterious “Managed Case Enterprise” that included other health insurance companies not named as defendants, the companies that developed the claims-processing software the defendants use, companies that review claims for the defendants, and several trade, standards-setting, and industry organizations and associations to which the defendants belong or with which the defendants work. This enterprise is a “system that allows [the defendants] to manipulate and control reimbursements to physicians and conceal the manner in which that is done.” Third Complaint ¶ 138. Based on these facts, the plaintiffs allege several different RICO violations. First, they contend that the defendants violated 18 U.S.C. §§ 1962(a) and (c) (Counts III and TV in the First Complaint; Count III in the Third Complaint). Section 1962(a) makes it unlawful for “any person who has received any income, derived directly or indirectly, from a pattern of racketeering-activity ... to use or invest, directly or indirectly, any part of such income ... [in the] operation of, any enterprise which is engaged in ... interstate ... commerce.” The defendants allegedly violated this provision by using money they obtained through racketeering activities — that is, underpaying doctors through the dishonest means specified in Sections I.A and I.B, thereby violating the federal criminal laws specified above — to further the Managed Care Enterprise. 18 U.S.C. § 1962(c) makes it unlawful for “any person employed by or associated with any enterprise engaged in ... interstate ... commerce, to conduct or participate, directly or indirectly, in the conduct of such enterprise’s affairs through a pattern of racketeering activity.” The plaintiffs assert that the defendants operated the Managed Care Enterprise by engaging in racketeering activity because the enterprise itself was created to systematically underpay doctors for the services they provide. Next, the plaintiffs contend that the defendants violated 18 U.S.C. § 1962(d), which prohibits conspiracies to violate other provisions of RICO by conspiring with each other to violate 18 U.S.C. §§ 1962(a) and (c), as discussed above. (Count I in both the First Complaint and Third Complaint). The plaintiffs further assert that the defendants violated 18 U.S.C. § 2 by aiding and abetting each other in violating 18 U.S.C. §§ 1962(a) and (c), as discussed above. (Count II in both the First Complaint and Third Complaint). Finally, based on these allegations, the plaintiffs seek injunctive and declaratory relief. (Count X in the First Complaint; Count IV in the Third Complaint). Having explained the federal claims for which the plaintiffs sought class certification, we now explore the “predominance” analysis mandated by Rule 23(b)(3). B. The defendants’ main contention is that the district court erred in certifying classes to litigate the RICO claims discussed above because the common issues of fact and law these claims involve do not predominate over the individualized issues involved that are specific to each plaintiff. Under Rule 23(b)(3), “[i]t is not necessary that all questions of fact or law be common, but only that some questions are common and that they predominate over individual questions.” In re Theragenics Corp. Secs. Litig., 205 F.R.D. 687, 697 (N.D.Ga.2002). In determining whether class or individual issues predominate in a putative class action suit, we must take into account “the claims, defenses, relevant facts, and applicable substantive law,” Cas-taño, 84 F.3d at 744, to assess the degree to which resolution of the classwide issues will further each individual class member’s claim against the defendant. “Whether an issue predominates can only be determined after considering what value the resolution of the class-wide issue will have in each class member’s underlying cause of action.” Rutstein v. Avis Rent-A-Car Sys., 211 F.3d 1228, 1234 (11th Cir.2000). Common issues of fact and law predominate if they “ha[ve] a direct impact on every class member’s effort to establish liability and on every class member’s entitlement to injunctive and monetary relief.” Ingram v. Coca-Cola Co., 200 F.R.D. 685, 699 (N.D.Ga.2001). Where, after adjudication of the classwide issues, plaintiffs must still introduce a great deal of individualized proof or argue a number of individualized legal points to establish most or all of the elements of their individual claims, such claims are not suitable for class certification under Rule 23(b)(3). See Perez v. Metabolife Int’l, Inc., 218 F.R.D. 262, 273 (S.D.Fla.2003) (declining class certification in part because “any efficiency gained by deciding the common elements will be lost when separate trials are required for each class member in order to determine each member’s entitlement to the requested relief’). An alternate formulation of this test was offered in Alabama v. Blue Bird Body Co., 573 F.2d 309 (5th Cir.1978). In that case, we observed that if common issues truly predominate over individualized issues in a lawsuit, then “the addition or subtraction of any of the plaintiffs to or from the class [should not] have a substantial effect on the substance or quantity of evidence offered.” Id. at 322. Put simply, if the addition of more plaintiffs to a class requires the presentation of significant amounts of new evidence, that strongly suggests that individual issues (made relevant only through the inclusion of these new class members) are important. Id. (“If such addition or subtraction of plaintiffs does affect the substance or quantity of evidence offered, then the necessary common question might not be present.”). If, on the other hand, the addition of more plaintiffs leaves the quantum of evidence introduced by the plaintiffs as a whole relatively undisturbed, then common issues are likely to predominate. C. In certifying the plaintiffs’ RICO claims, the district court found that common questions of fact and law predominate because this case “involves a conspiracy and joint efforts to monopolize and restrain trade.” Managed Care Litig., 209 F.R.D. at 696. The common factual issues that predominated over individualized ones included Defendants’ medical necessity requirements, Defendants’ use of actuarial guidelines, Defendants’ use of automated claims system and comparable software capable of adjusting CPT codes and reimbursement rates and automatically delaying and denying claims as well as other uniform activities designed to deny, delay or decrease reimbursement or payments to physicians. Id. The existence of a conspiracy, and whether the defendants aided and abetted each other, were also issues common to all of the plaintiffs that tended to predominate. Id. We agree with this analysis. 1. The plaintiffs here allege the type of nationwide conspiracy which we intimated in Blue Bird Body Co., 573 F.2d 309, would probably be appropriate for nationwide class certification. In that case, the State of Alabama sought to represent a nationwide class of all governmental entities in the United States that purchased school buses, alleging that the defendants engaged in a nationwide price-fixing conspiracy in violation of federal antitrust laws. The only evidence to which the plaintiffs pointed to support their claims of a nationwide conspiracy, however, was an excerpt from a deposition that referred solely to price-fixing within Alabama. We recognized that the plaintiffs might have intended to establish proof of a nationwide conspiracy “through testimony, exhibits, etc., of the various school bus markets on a state by state basis.” Id. at 822. We held, If this is indeed the plaintiffs’ plan, then the national class should not have been certified since there would be no evidence linking the different conspiracies to each other in order to establish the one “common” conspiracy. Common issues of fact do not predominate in such a situation even though all the plaintiffs might have separate causes of actions against the same defendants based upon similar theories of recovery. Id. at 323 (footnote omitted). In this ease, in contrast, all of the defendants operate nationwide and allegedly conspired to underpay doctors across the nation, so the numerous factual issues relating to the conspiracy are common to all plaintiffs. Cf. Kirkpatrick v. J.C. Bradford & Co., 827 F.2d 718, 725 (11th Cir.1987) (granting class certification because “each of the complaints alleges a single conspiracy and fraudulent scheme against a large number of individuals and thus is particularly appropriate for class action” (quotation marks and citation omitted)). This case stands in stark contrast to many others in which we found individualized issues to predominate. For example, in Jackson v. Motel 6 Multipurpose, Inc., 130 F.3d 999 (11th Cir.1997), a putative class of African-American plaintiffs sued Motel 6, alleging that the chain either denied African-Americans accommodations altogether, or rented them only dirty rooms. We declined to certify the class because the plaintiffs’ claims would have “require[d] distinctly case-specific inquiries into the facts surrounding each alleged incident of discrimination.” Id. at 1006. We explained: The issues that must be addressed include not only whether a particular plaintiff was denied a room or was rented a substandard room, but also whether there were any rooms vacant when that plaintiff inquired; whether the plaintiff had reservations; whether unclean rooms were rented to the plaintiff for reasons having nothing to do with the plaintiffs race; whether the plaintiff, at the time that he requested a room, exhibited any non-racial characteristics legitimately counseling against renting him a room; and so on.... These issues are clearly predominant over the only issue arguably common to the class — whether Motel 6 has a practice or policy of racial discrimination. Id. We came to the same conclusion in Rut-stein, 211 F.3d 1228, where we denied class certification to a group of plaintiffs alleging that Avis refused to establish corporate accounts for Jewish companies. We held that each plaintiffs individualized allegations necessarily predominated over the issue of whether Avis had discriminatory policies because “[e]ach plaintiff [would] have to bring forth evidence demonstrating that the defendant had an intent to treat him or her less favorably because of the plaintiffs Jewish ethnicity.” Id. at 1235. We explained that individual claims for discrimination are inextricably bound up in innumerable case-specific facts, for “even if [the] plaintiffs [could] demonstrate that a general policy or practice of discrimination was applied in their cases, Avis [could] escape liability by showing that an individual plaintiff would have been denied or terminated even if no such policy or practice had existed.” Id. at 1286. The individual issues that must be addressed [regarding each individual plaintiff] include not only whether Avis actually denied a particular plaintiff a corporate account, gave the plaintiff a less advantageous account, or cancelled the plaintiffs account, but also whether the particular plaintiff was of the age required by Avis to qualify for a corporate account; whether the plaintiff met the financial criteria for a corporate account; whether the nature of the plaintiffs expected use of Avis vehicles would make the transaction cost-justified for Avis; whether the plaintiff would be renting cars from Avis in a criminally high-risk or low-risk geographical area; whether the Avis employee who allegedly denied the plaintiff a corporate account judged the caller-applicant to be lying about his or her qualifications based on information not related to the caller’s ethnicity; and so on, and so on. All of these issues are clearly case-specific, and they will all have to be addressed in one way or another in order for each plaintiff to demonstrate a prima facie case of intentional discrimination. Id. at 1235. Motel 6 and Rutstein were both cases in which individuals were seeking to litigate separate discrimination claims that arose from a variety of individual incidents together in the same class action simply because they alleged that the acts of discrimination occurred pursuant to corporate policies. In the instant case, however, the plaintiffs’ RICO claims are not simply individual allegations of underpayments lumped together, and the allegation of an official corporate policy or conspiracy is not simply a piece of circumstantial evidence being used to support such individual underpayment claims. Instead, the very gravamen of the RICO claims is the “pattern of racketeering activities” and the existence of a national conspiracy to underpay doctors. These are not facts from which jurors will be asked to infer the commission of wrongful acts against individual plaintiffs; these very facts constitute essential elements of each plaintiffs RICO claims. While the existence of a policy of discrimination did not constitute an element of any of the causes of action in Rutstein or Motel 6, the existence of a general conspiracy to violate certain federal laws, or a pattern and practice of aiding and abetting other HMOs’ violations of those laws, is an essential element of each individual plaintiffs RICO-related claims. Cf. Rutstein, 211 F.3d at 1285 (“Whether Avis maintains a policy or practice of discrimination may be relevant in a given case, but it certainly cannot establish that the company intentionally discriminated against every member of the putative class.”). Thus, while corporate policies were only circumstantially relevant in the discrimination cases,' and insufficient to overcome the tremendous individualized issues of fact that remained in those cases, they constitute the very heart of the plaintiffs’ RICO claims here, and would necessarily have to be re-proven by every plaintiff if each doctor’s claims were tried separately. 2. The defendants contend that class certification is inappropriate because the RICO claims are based, in large part, on allegations of mail and wire fraud. Under Sikes v. Teleline, Inc., reliance may not be presumed in fraud-based RICO actions; instead, the evidence must demonstrate that each individual plaintiff actually relied upon the misrepresentations at issue. 281 F.3d 1350, 1360, 1362 (11th Cir.2002) (holding that, to make out a civil RICO claim based on mail or wire fraud, a plaintiff must demonstrate that he “relied on a misrepresentation made in furtherance of [a] fraudulent scheme” because “[i]t would be unjust to employ a presumption to relieve a party of its burden of production when that party has all the evidence regarding that element of the claim”). The defendants contend that, because each individual plaintiff must specifically show that he, personally, relied on the misstatements at issue, this individualized issue necessarily predominates. The Fifth Circuit, in Castaño, 84 F.3d at 745 (which is not binding upon us), held that, under Simon v. Merrill Lynch, Pierce, Fenner & Smith, Inc., 482 F.2d 880 (5th Cir.1973) (citations omitted) (which is binding on us), “a fraud class action cannot be certified when individual reliance will be an issue.” This is a misinterpretation of Simon, which in fact stated only that [i]f there is any material variation in the representations made or in the degrees of reliance thereupon, a fraud case may be unsuited for treatment as a class action.... [I]f the writings contain material variations, emanate from several sources, or do not actually reach the subject investors, they are no more valid a basis for a class action than dissimilar oral representations. Simon, 482 F.2d at 882. As this quote demonstrates, we declined certification in Simon because of the plaintiffs “failure to prove any standardized representations by [the defendant].” Id. at 883. In this case, however, the plaintiffs allege that while the defendants engaged in a variety of specific communications with physicians, they all conveyed essentially the same message— that the defendants would honestly pay physicians the amounts to which they were entitled. Under well-established Eleventh Circuit precedent, the simple fact that reliance is an element in a cause of action is not an absolute bar to class certification. In Kirkpatrick, 827 F.2d at 720, for example, the plaintiffs sought class certification of their claim that various brokerage firms “disseminat[ed] materially misleading information” concerning the financial condition of a company in which the plaintiffs had purchased limited partnership interests. Among the provisions under which the plaintiffs sought recovery was Rule 10b-5 (17 C.F.R. § 240.10b-5), promulgated under the Securities and Exchange Act of 1934, 15 U.S.C. § 78j. We reversed the district court’s order denying certification under Rule 23(b)(3), concluding that common issues of fact and law predominated over individual issues. The district court’s main concern was that each of the plaintiffs was individually obligated to demonstrate his or her reliance on the defendants’ misstatements to make out claims under Rule 10b-5. We held, however, In view of the overwhelming number of common factual and legal issues presented by plaintiffs’ misrepresentation claims, ... the mere presence of the factual issue of individual reliance could not render the claims unsuitable for class treatment. Here, ... each of the complaints alleges a single conspiracy and fraudulent scheme against a large number of individuals and thus is particularly appropriate for class action. Kirkpatrick, 827 F.2d at 724-25 (quotation marks and citation omitted). We follow Kirkpatrick here for two reasons. First, the common issues of fact discussed in the previous Section, concerning the existence of a national conspiracy, a pattern of racketeering activity, and a Managed Care Enterprise, are quite substantial. They would tend to predominate over all but the most complex individualized issues. Second, while each plaintiff must prove his own reliance in this case, we believe that, based on the nature of the misrepresentations at issue, the circumstantial evidence that can be used to show reliance is common to the whole class. That is, the same considerations could lead a reasonable factfinder to conclude beyond a preponderance of the evidence that each individual plaintiff relied' on the defendants’ representations. The alleged misrepresentations in the instant case are simply that the defendants repeatedly claimed they would reimburse the plaintiffs for medically necessary services they provide to the defendants’ insureds, and sent the plaintiffs various EOB forms claiming that they had actually paid the plaintiffs the proper amounts. While the EOB forms may raise substantial individualized issues of reliance, the antecedent representations about the defendants’ reimbursement practices do not. It does not strain credulity to conclude that each plaintiff, in entering into contracts with the defendants, relied upon the defendants’ representations and assumed they would be paid the amounts they were due. A jury could quite reasonably infer that guarantees concerning physician pay — the very consideration upon which those agreements are based — go to the heart of these agreements, and that doctors based their assent upon them. This is a far cry from the type of “presumed” reliance we invalidated in Sikes. Consequently, while each plaintiff must prove reliance, he or she may do so through common evidence (that is, through legitimate inferences based on the nature of the alleged misrepresentations at issue). For this reason, this is not a case in which individualized issues of reliance predominate over common questions. 3. The defendants point out that individualized determinations are necessary to determine the extent of damages allegedly suffered by each plaintiff. While this is undoubtedly true, it is insufficient to defeat class certification under Rule 23(b)(3). “[NJumerous courts have recognized that the presence of individualized damages issues does not prevent a finding that the common issues in the case predominate.” Allapattah Servs. v. Exxon Corp., 333 F.3d 1248, 1261 (11th Cir.2003), reh’g en banc denied, 362 F.3d 739 (11th Cir.2004); see, e.g., In re Tri-State Crematory Litig., 215 F.R.D. 660, 692 n. 20 (N.D.Ga.2003) (“The requirement of determination of damages on an individual basis does not foreclose a finding of predominance or defeat certification of the class.”). “[I]n assessing whether to certify a class, the Court’s inquiry is limited to whether or not the proposed methods [for computing damages] are so insubstantial as to amount to no method at all.... [Plaintiffs] need only come forward with plausible statistical or economic methodologies to demonstrate impact on a class-wide basis.” In re Terazosin Hydrochloride Antitrust Litig., 220 F.R.D. 672, 698 (S.D.Fla.2004) (quotation marks omitted). Particularly where damages can be computed according to some formula, statistical analysis, or other easy or essentially mechanical methods, the fact that damages must be calculated on an individual basis is no impediment to class certification. It is primarily when there are significant individualized questions going to liability that the need for individualized assessments of damages is enough to preclude 23(b)(3) certification. See, e.g., Sikes, 281 F.3d at 1366 (“These claims will involve extensive individualized inquiries on the issues of injury and damages — so much so that a class action is not sustainable.”); Rutstein, 211 F.3d at 1234, 1240 (declining to certify a class because “most, if not all, of the plaintiffs’ claims will stand or fall ... on the resolution of ... highly case-specific factual issues” and “liability for damages is a necessarily individualized inquiry”). Of course, there are also extreme cases in which computation of each individual's damages will be so complex, fact-specific, and difficult that the burden on the court system would be simply intolerable, see, e.g., Windham v. Am. Brands, Inc., 565 F.2d 59, 70 (4th Cir.1977) (“The district court estimated — conservatively, we think — that in the absence of a practical damage formula, determination of individual damages in this case could consume ten years of its time. The propriety of placing such a burden on already strained judicial resources seems unjustified.”), but we emphasize that such cases rarely, if ever, come along. In this case, even though individualized damage inquiries are necessary, many of them can be accomplished simply through reference to the HCFA-1500 forms or the HMO’s records of which patients registered with doctors who are reimbursed through a capitation system. Cf. Roper v. Consurve, Inc., 578 F.2d 1106, 1112 (5th Cir.1978) (“While it may be necessary to make individual fact determinations with respect to charges, if that question is reached, these will depend on objective criteria that can be organized by a computer, perhaps with some clerical assistance.”). In addition, even if many plaintiffs’ claims require corroboration and individualized consideration, such inquiries are outweighed by the predominating fact that the defendants allegedly conspired to commit, and proceeded to engage in, a pattern of racketeering activities to further their Managed Care Enterprise. It is ridiculous to expect 600,000 doctors across the nation to repeatedly prove these complicated and overwhelming facts. D. Because we are reviewing the district court’s certifications under an abuse of discretion standard, we affirm. Nevertheless, it seems that the plaintiffs could comfortably be split into two Subclasses based on their reimbursement scheme: those operating on a fee-for-serviee basis and those with capitation contracts. While the existence of the conspiracy is equally relevant to both groups of plaintiffs, it seems that the capitation providers’ claims revolve around some additional common issues that are not relevant to the fee-for-service providers. Moreover, because the capitation providers’ primary allegation is that the HMOs did not pay them for all the patients actually registered to them, their individualized damage inquiries seem to be limited to an examination of the HMOs’ records, and do not require as much potentially in-depth analysis as the fee-for-ser-viee providers’ claims. Because this issue was not raised on appeal, however, we leave it to the district court to consider in the first instance whether the creation of these Subclasses might be a superior way of proceeding. III. The First Complaint contained five state-law claims. In the plaintiffs’ Third Complaint, one of the original state law claims (Count V of the First Complaint, quantum meruit) was dropped, and four additional state-law claims were added (Counts VIII, IX, XI, and XII of the Third Complaint). Because the quantum meruit claim is no longer an issue in this lawsuit, we vacate the district court’s grant of class certification regarding that issue. Similarly, because the district court order being appealed did not address the additional state law claims raised for the first time in the Third Complaint, there is nothing for us to review about them. Consequently, we focus on the four remaining state law claims raised in the First Complaint. Section A addresses the breach of contract claims, Section B discusses unjust enrichment, Section C turns to alleged violations of state prompt-pay statutes, and Section D considers the district court’s certification of a subclass concerning alleged violations of California law. A. The plaintiffs’ breach of contract claims (Count VI in the First Complaint; Count V in the Third Complaint) are not amenable to class certification under Rule 23(b)(3) because, although they are based on questions of contract law that are common to the whole class, the individualized issues of fact they entail will probably predominate. These claims allege that “Defendants have breached their obligation to pay Plaintiffs and class members for medically necessary services in accordance with their contractual obligations.” First Complaint ¶ 335. “In a multi-state class action, variations in state law may swamp any common issues and defeat predominance.” Castano, 84 F.3d at 741. It goes without saying that class certification is impossible where the fifty states truly establish a large number of different legal standards governing a particular claim. See Sikes, 281 F.3d at 1367 n. 44 (“Assuming that the district court was correct in ruling that the laws of all fifty states apply, that alone would render the class unmanageable.”); Andrews v. Am. Tel. & Tel. Co., 95 F.3d 1014, 1024 (11th Cir.1996) (“The appellants cite the need to interpret and apply the gaming laws of all fifty states to assess the legality of each 900-number program as foremost among the difficulties in trying the gambling claims on a class basis, and we agree.”); Kirkpatrick, 827 F.2d at 725 (upholding the district court’s denial of class certification because “the state law claims would require application of the standards of liability of the state in which each purchase was transacted”). But see In re St. Jude Med., Inc., MDL No. 01-1396, 2004 WL 45504, at *4, 2004 U.S. Dist. LEXIS 149, at *12 (D.Minn. Jan. 5, 2004) (“[T]he Court is not convinced that it is per se impossible to certify and successfully try a class action involving the laws of 50 states_”). On the other hand, if a claim is based on a principle of law that is uniform among the states, class certification is a realistic possibility. See In re Terazosin Hydrochloride Antitrust Litig., 220 F.R.D. 672, 695 (S.D.Fla.2004) (noting that because “the essential elements of [the plaintiffs’] antitrust claims do not vary significantly from state-to-state, ... they are susceptible to proof using common evidence”). In In re GMC Pick-Up Truck Fuel Tank Products Liability Litigation, for example, the Third Circuit held that class certification was appropriate because “we cannot conceive that each of the forty-nine states (excluding Texas) represented here has a truly unique statutory scheme.... ” 55 F.3d 768, 818 (3d Cir.1995); cf. Simon, 482 F.2d at 883 (declining class certification in part because “the geographical dispersion of the alleged representations would bring into issue various state common law standards. With no single law governing the entire class, common issues of law cannot be shown to warrant Rule 23 treatment.”). Similarly, if the applicable state laws can be sorted into a small number of groups, each containing materially identical legal standards, then certification of subclasses embracing each of the dominant legal standards can be appropriate. See, e.g., Krell v. Prudential Ins. Co. of Am., 148 F.3d 283, 315 (3d Cir.1998) (“Courts have expressed a willingness to certify nationwide classes on the ground that relatively minor differences in state law could be overcome at trial by grouping similar state laws together and applying them as a unit.”); Walsh v. Ford Motor Co., 807 F.2d 1000, 1017 (D.C.Cir.1986) (holding that class certification is appropriate where “variations [in state law] can be effectively managed through creation of a small number of subclasses grouping the states that have similar legal doctrines”). In such a case, of course, a court must be careful not to certify too many groups. “If more than a few of the laws of the fifty states differ, the district judge would face an impossible task of instructing a jury on the relevant law....” In re Am. Med. Sys., 75 F.3d 1069, 1085 (6th Cir.1996). The burden of showing uniformity or the existence of only a small number of applicable standards (that is, “groupability”) among the laws of the fifty states rests squarely with the plaintiffs. Walsh, 807 F.2d at 1017 (“[T]o establish commonality of the applicable law, nationwide class action movants must credibly demonstrate, through an extensive analysis of state law variances, that class certification does not present insuperable obstacles.”) (quotation marks omitted); Powers v. Gov’t Employees Ins. Co., 192 F.R.D. 313, 318-19 (S.D.Fla.1998) (“To certify a multi-state class action, a plaintiff must prove through ‘extensive analysis’ that there are no material variations among the law of the states for which certification is sought. If a plaintiff fails to carry his or her burden of demonstrating similarity of state laws, then certification should be denied.”) (citation omitted); cf. Carnegie v. Household Int’l, Inc., 220 F.R.D. 542, 549 (N.D.Ill.2004) (declining class certification because “[i]f the laws of the fifty states all follow one of a small number of identical standards, [the named plaintiff] has not made any attempt to prove that this is the case”). In this case, the plaintiffs allege that the only real legal issue pertinent to their breach of contract claims is the definition of “breach,” which does not differ from state to state. Judge Marcus once held, “Whether [a] contract! ] ... has been breached is a pure and simple question of contract interpretation which should not vary from state to state.” Indianer v. Franklin Life Ins. Co., 113 F.R.D. 595, 607 (S.D.Fla.1986), overruled in part on other grounds by Ericsson GE Mobile Communs., Inc. v. Motorola Communs. & Elecs., Inc., 120 F.3d 216, 219 n. 12 (11th Cir.1997); accord Leszczynski v. Allianz Ins., 176 F.R.D. 659, 672 (S.D.Fla.1997); see also Kleiner v. First Nat’l Bank of Atlanta, 97 F.R.D. 683, 694 (N.D.Ga.1983) (“The application of various state laws would not be a bar where, as here, the general policies underlying common law rules of contract interpretation tend to be uniform.”). Based on “genius, general knowledge and previous information,” Penn. Nat’l Mut. Cas. Ins. Co. v. Barnett, 445 F.2d 573, 575-76 (5th Cir.1971), we are inclined to agree. A breach is a breach is a breach, whether you are on the sunny shores of California or enjoying a sweet autumn breeze in New Jersey. See Black’s Law Dictionary 200 (8th ed. 2004) (defining “breach of contract” as “[violation of a contractual obligation by failing to perform one’s own promise”). Moreover, while the plaintiffs’ breach of contract claims necessarily implicate the contract law of all fifty states (since members of the putative class practice in every jurisdiction in the country), the defendants fail to argue on appeal that there are any relevant differences in the applicable laws among these jurisdictions. Their brief fails to point to any material differences among state laws addressing breaches of contract. Cf. In re Rhone-Poulenc Rorer, Inc., 51 F.3d 1293, 1300-01 (7th Cir.1995) (declining class certification because the laws of the several states concerning “negligence, including subsidiary concepts such as duty of care, foreseeability, and proximate cause” differed sufficiently from each other that they could not be consolidated into one or a few standards). Consequently, we accept the proposition that the applicable state laws governing contract interpretation and breach are sufficiently identical to constitute common legal issues in this case. While this relatively simple issue of law is common to all the breach of contract claims, it is far outweighed by the individualized issues of fact pertinent to these claims. The plaintiffs contend that all of the agreements at issue require that doctors be reimbursed at a “reasonable rate” for the “medically necessary” services they provide. We nevertheless recognize that this case involves the actions of many defendants over a significant period of time and that each defendant throughout this period utilized many different form contracts. Indeed, each defendant contracted with different types of care-providing entities, including individual physicians, partnerships, medical practice groups, and the like, each of which necessitated a different type of contract. The sheer number of contracts involved is one factor that makes us hesitant to conclude that common issues of fact predominate; this is not a situation in which all plaintiffs signed the same form contract. See Broussard v. Meineke Disc. Muffler Shops, 155 F.3d 331, 340 (4th Cir.1998) (“[Pjlaintiffs simply cannot advance a single collective breach of contract action on the basis of multiple different contracts.”); cf. Kleiner, 97 F.R.D. at 692 (“When viewed in light of Rule 23, claims arising from interpretations of a [single] form contract appear to present the classic case for treatment as a class action.... ”). The plaintiffs might be able to establish by admission, stipulation, or judicial finding of undisputed fact that, notwithstanding their differences in form or language, all the contracts at issue call for “reasonable compensation” for “medically necessary services.” See Kleiner, 97 F.R.D. at 694-95 (“[A]t this point[,] the fact that not all contracts are identical is not sufficient to overcome the apparent commonality of issues that they present.”). Even assuming, however, that this is a common fact, it, along with the common legal issue of what constitutes a “breach” under state law, is dwarfed by the individualized issues of fact to be resolved. The facts that the defendants conspired to underpay doctors, and that they programmed their computer systems to frequently do so in a variety of ways, do nothing to establish that any individual doctor was underpaid on any particular occasion. See Rutstein, 211 F.3d at 1235 (“Whether Avis maintains a policy or practice of discrimination may be relevant in a given case, but it certainly cannot establish that the company intentionally discriminated against every member of the putative class.”); Motel 6, 130 F.3d at 1006 (holding that plaintiffs alleging racial discrimination had failed to show “predominance” because proof concerning the existence of a general policy of racial discrimination does not show whether any individual plaintiff was actually discriminated against); Ramirez v. DeCoster, 194 F.R.D. 348, 353 (D.Me.2000) (holding that plaintiffs “do not necessarily satisfy the requirement that questions of law or fact predominate merely by alleging a pattern or practice claim”). The evidence that each doctor must introduce to make out each breach claim is essentially the same whether or not a general conspiracy or policy of breaching existed. For example, regardless of whether facts about the conspiracy or computer programs are proven, each doctor, for each alleged breach of contract (that is, each alleged underpayment), must prove the services he provided, the request for reimbursement he submitted, the amount to which he was entitled, the amount he actually received, and the insufficiency of the HMO’s reasons for denying full payment. There are no common issues of fact that relieve each plaintiff of a substantial portion of this individual evidentiary burden. Cf. Terazo-sin Litig., 220 F.R.D. at 694 (“[Wihen there exists generalized evidence which proves or disproves an element on a simultaneous, class-wide basis, since such proof obviates the need to examine each class member’s individual position, the predominance test will be met.”) (quotation marks omitted). WTiile allegations concerning the defendants’ conspiracy to underpay doctors, or their policy of and aiding and abetting each other in underpaying doctors, went directly to material elements of each individual plaintiffs RICO claim, here they are, at best, merely circumstantial evidence tangentially relevant to each individual plaintiffs breach of contract claim. Another crucial reason why the plaintiffs cannot establish predominance of class-wide facts on their breach of contract claims is that, although each of the defendants allegedly breached their contracts in the same general ways, they did so through a variety of specific means that are not subject to generalized proof for a large number of physicians. See Andrews, 95 F.3d at 1023 (rejecting class certification because while “at a general level, the predominant issue presented ... is whether the appellants were involved in the operation of illegal gambling schemes[,] .... as a practical matter, the resolution of this overarching common issue breaks down into an unmanageable variety of individual legal and factual issues”). For example, the plaintiffs claim that the defendants often grouped together separate procedures specified on HCFA-1500 forms submitted by doctors, frequently reimbursing them for only one of the procedures actually performed. If the plaintiffs were able to prove that the billing programs automatically grouped together the first and second procedures specified on the HCFA-1500 form, regardless of what they were, paying doctors only for the first, then the breach of contract issue would be subject to generalized proof. After establishing that the computer program worked in this way, the doctors would be able to simply submit their HCFA-1500 forms to the court for an easy determination of damages; no further evidence of breach would be necessary. This is not the type of allegation the plaintiffs make, however. The algorithms by which the computer programs allegedly groups procedures appear to be much more varied and complicated than this. Instead of applying one specific universal rule to cheat all doctors (e.g. automatically deducting $100 from everyone’s claim), the reimbur