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Capitation-based reimbursement significantly influences the practice of medicine. As physicians, we need to assure that payment models do not jeopardize the care we provide when we accept higher levels of personal financial risk. In this paper, we review the literature relevant to capitation, consider the interaction of financial incentives with physician and medical risk, and conclude that primary care physicians need to work to assure that capitated systems incorporate checks and balances which protect both patients and providers. We offer the following proposals for individuals and groups considering capitated contracts: (1) reimbursement for primary care physicians should recognize both individual patient encounters and the administrative work of patient care management; (2) reimbursement for subspecialists should recognize both access to subspecialty knowledge and expertise as well as patient care encounters, but in some situations, subspecialists may provide the majority of care to individual patients and will be reimbursed as primary care providers; (3) groups of physicians should accept financial risk for patient care only if they have the tools and resources to manage the care; (4) physicians sharing risk for patient care should meet regularly to discuss care and resource management; and (5) physicians must disclose the financial relationships they have with health plans and medical care organizations, and engage patients and communities in discussions about resource allocation. As a payment model, capitation offers opportunities for primary care physicians to influence the future of health care by improving the management of resources at a local level.
As practitioners, we are well aware of the monumental changes occurring in our workplace, be it the office, the clinic, or the hospital. We have witnessed the expectations for health care reform rise and fall as efforts to develop and enact the Clinton Health Plan gripped the country from early 1993 to the late summer of 1994.1 We have shared the national concern about the cost of health care; we have watched as corporate profits have been created through hospital consolidation and the marketing of health care2; and we have worried, in our private moments, about whether our work, which has been fundamentally based on personal encounters, will have the same value to us and to our patients in the future.
This report represents the work of a task force established within the Society for General Internal Medicine Health Policy Committee. Our intent was to clarify our own understanding of how capitation might be adapted to improve the care of our patients. First, we reviewed the literature concerning financial incentives in clinical practice. Second, we examined the impact of capitation on a variety of risks—patients' health risks, society's financial risk, and physicians' financial risk. Third, through a process of drafting, review, and final consensus, we developed a series of proposals designed to help physicians and physician groups as they discuss approaches to capitation.
Ample evidence suggests that physicians respond to economic incentives in their practices. In fee-for-service (FFS) practices, physicians tend to order more tests.3,4 consultations,5 elective procedures,6,7 and hospitalizations.8,9 When physicians have ownership of consulting services, their rates of utilization of these ancillary services are higher.10,11 HMOs which reimburse physicians on a FFS basis are associated with higher rates of hospitalization than those which use capitation.12 In capitated practices, patients have fewer overall hospitalizations,13 see specialists less often,14 and may underuse quality monitoring for chronic illness while more intensively monitoring areas of potential overuse, such as cesarean delivery rates.15 Recognizing the impact of reimbursement on physician practice, we sought to develop proposals that blunt the overuse incentives of FFS and the underuse incentives of capitation.
As practicing physicians, our work demands that we manage a number of concurrent risks. Our foremost responsibility is to manage the individual health risks of our patients, be they risks associated with lifestyle, predisposition to illness, or diagnosed conditions. We also have a broader social responsibility16–18 to prudently use the resources society allocates to health care, society's financial risk. Finally, we face personal financial risk from decisions made by ourselves and others. Every physician reimbursement model poses different distributions of these risks: patient health risk, society's financial risk, and physician financial risk.
Our heritage as medical practitioners is based on the payment for service around the individual encounter (i.e., FFS). In contrast, capitation dissociates physician reimbursement from the patient encounter.19–22 An organization, a group of practitioners, or a single physician contracts to deliver care for the individual patient for a defined interval of time. Payment is made prospectively on a “per-member-per-month” (PMPM) basis for a contracted number of months.
Capitation has the potential to increase patient health risk15,23,24 because there are incentives to reduce services and incentives to defer care beyond the prepayment interval. Counterbalancing these incentives are the theoretical incentives to invest in medical care that can decrease long-term medical costs through disease prevention and early treatment. Practices reporting a larger proportion of income from capitated contracts are more likely to base primary care physician compensation on measures of quality and utilization.25 Unfortunately, the incentives to make these investments are mitigated by the relatively high rates of turnover, as patients move from plan to plan, precluding long-term financial benefit.26 Society's financial risk is minimal in the short term. In the long term, society may save money if capitation results in increased investments in prevention and early treatment, or society may lose money if delayed care produces more expense. Physician personal financial risk can be high, particularly if a few patients develop high cost illness.27 Since financial risk is transferred to the physician level, there are financial disincentives for a physician or a group to take on the care of complex or chronically ill patients.26 The incentive to avoid patients who are likely to have high per capita costs during the contract interval is only partially buffered by risk adjustment or “stop-loss” insurance. In groups where physicians pool risk, incomes become highly interdependent, adding another level of complexity. Knowing that your clinical decisions might adversely affect the incomes of your colleagues could influence decision making and adversely affect patient care.
A distinction can be made between 2-tiered and 3-tiered capitated payments. With 2-tiered capitation, a health plan contracts directly with a physician, who is then paid on a PMPM basis. The financial benefits and risks associated with caring for a panel of patients flow directly to the physician. Under 3-tiered capitation, the plan contracts with an intermediary group that in turn has considerable latitude over how physicians are paid,19 either by capitation, FFS, salary, or a combination. The advantages of 3-tiered capitation are increased flexibility in physician payment modeling, enhanced physician leverage in contract negotiations with payers, and standardization of information systems. However, these advantages may require additional administrative costs and investments.
Factors further influencing the impact of capitation on a practice and its patients include: (1) the size of the group of patients for whose costs the physician is assuming financial risk; (2) the patient's “risk group”28 as defined by diagnoses; (3) the scope of capitated services; (4) other physician incentives in place (both financial and nonfinancial)29; (5) the adequacy of the capitated payments including whether they are “risk-adjusted” for disease type and/or severity30–32; (6) protections against undue financial risk22; (7) the proportion of practice revenue derived from capitation22; and (8) the availability of savings (if any) from cost efficiency for use to improve services.
Risk adjustment32–35 is one of the major challenges of capitation. Capitated payments are typically based on average costs of care. However, costs of care are directly related to health status. For example, under FFS, an elderly Medicare beneficiary reporting poor health will have subsequent Medicare annual expenditures 5 times greater than that of a beneficiary reporting excellent health, although their capitated payments would be the same if they were the same age and gender and lived in the same area.31 As a result, practices that care for sicker patients could encounter substantial losses. Because of this “adverse” selection, unintended incentives to withhold services can evolve.30
Risk adjustment is used to address predictable differences in the costs of care.32,35,36 Age, gender, diagnosis (inpatient and/or outpatient), or health status information have been used. Risk adjustment systems developed for use by Medicare and Medicaid29,36 are intended to limit overpayment or underpayment for plan enrollees resulting from health status differences.37,38 However, these risk adjusters all have limitations.34,39 While they may reduce financial incentives to enroll only healthier patients at the health plan level, they may not be adequate to protect against variation in costs at the physician or small-group practice level because much of this variation is unpredictable.29 For example, the 1992 mean annual expenses for Medicare patients with coronary artery disease ranged from $1,702 to $19,959, depending on additional comorbidity.31
Even if risk adjusters are used, physicians still need protection against undue financial risk arising from patients who incur unpredictably high-cost illnesses. Reinsurance, “stop-loss” clauses, and “risk corridors” have all been employed for this purpose.27 Reinsurance typically covers the cost of care for a patient or group of patients whose costs exceed a given specified amount. “Stop-loss” clauses can be incorporated into capitation contracts to achieve the same goal by covering individual expenses beyond established thresholds.22 “Risk corridors” set limits on the dollar amount of risk or gain that may be experienced for individual patients, e.g., 10% to 20% above or below capitation payments. Unfortunately, many physicians who have capitated contracts lack these basic protections.22
Disease “carve-outs” can also be used to limit risk by narrowing the range of services covered under a capitated care contract. With carve-outs, specific services (e.g., mental health, substance abuse) or care of specific disease conditions (e.g., AIDS, cancer, heart failure) are provided by designated providers under contract with the health plan or physician group. While potentially beneficial in some circumstances, in other circumstances carve-outs can fragment care, undermine the physician-patient relationship, and provide disincentives for generalist physicians to provide comprehensive care. In the worst cases, carve-outs become a tool to limit access by making the referral process awkward or inconvenient.40
Establishing the minimum patient panel size for accepting risk is problematic. Capitated payments to small groups or individual doctors, for the most part, violate the law of large numbers, whereby low risk individuals balance those at high risk.28 Evaluating a “safe” level of risk for a practice requires the weighing of several factors: (1) the type of practice (primary care vs specialty care); (2) the severity of illness and the need for health care, the “case-mix”; (3) the scope of capitation (risk for own services vs risk for own services as well as ancillary services, hospitalization expenses, and specialty care); (4) the level of “stop-loss” coverage or reinsurance; (5) the proportion of practice revenue covered by the contract; and (6) the historical variability in patient expenditures for the practice (practitioner-to-practitioner variability). Most analysts agree that a prudent incentive structure should not link an individual doctor's financial well-being tightly to a specific choice for a specific patient, arguing that the risk pool in capitated arrangements should be larger than individual physician's practices.20 Also, it is difficult for small practices to have the financial reserves or access to capital outside the practice to enable them to invest in the information systems needed to track resource use. Despite all this, many physicians accept such financial risk contracts, even though they are less satisfied with the care they provide.41 Although large physician practices are most likely to hold capitated contracts, a 1995 survey found that one fourth of solo practitioners and approximately one third of those in practices with 2 to 5 physicians accepted capitated contracts.20 American Medical Association data from 1997 show that the percentage of practice income from capitated contracts was 9% for internal medicine and 13% for family practice.42
In summary, there are many elements affecting the structure of capitated compensation arrangements, each with differing financial incentives, each exposing patients, society, and ourselves as physicians to different risks. Our challenge is to manage these risks to the best of our abilities, keeping paramount our responsibilities to the individual patient to provide care with the resources allocated without exploiting the system for personal financial gain.
Cost containment efforts will continue to drive changes in health care as employers, state and federal governments, and other payers demand more restraint of expenditures. Physicians have a central role, but that role may take 2 forms. Physicians may become de facto employees of health care delivery organizations and deliver care according to external regulation, or physicians may proactively develop the collaborative relationships that will allow them to practice good medicine, achieve efficiencies in care delivery, and substantially influence the organizations in which they practice. Believing that our work as physicians is central to the success of health care delivery in our society, the task force members favor a proactive approach, beginning with and rooted firmly in a commitment to patient care, collaboration with professional colleagues, and participation in practice operations.
There is a compelling economic logic to capitation because it allows many different types of payers to prospectively individualize payment for health care,43–45 but there are tremendous challenges to the process of pooling financial risk at the practice level. Ideally, risk-adjusted capitated payments will be developed to reflect the higher costs for individual physicians or practices who disproportionally care for sicker patients. Because even the best available risk adjustment procedures can explain only part of the variation in an individual's medical costs, the financial viability for physicians or groups is dependent on the ability to pool risk over a sufficient number of patients. Table 1 outlines a series of critical questions physicians should ask as they assess potential capitation arrangements.
Although we remain concerned about the conflicts inherent in capitation and its potential threats to our patients and our profession, we also recognize the opportunities of capitation to improve patient care, and offer the following proposals for groups of physicians organizing capitated reimbursement (see Fig. 1):
Our proposals are a beginning point for discussions that need to develop within individual practices and the community of primary care physicians. Many questions are left unanswered by our deliberations and in the published literature. Our goal has been to assess the reported experience and to promote an expanded discussion of capitation in the medical community.
The patient care coordination skills developed as a necessity from sharing capitated risk may improve our care for those with insurance, but there remains the challenge of caring for the uninsured. As physicians, we should not maintain a health delivery system that segregates our patients by the presence or absence of health insurance coverage. Almost a quarter of those with whom we share virtually all other resources including the economy, the environment, and the educational system are excluded from routine health care because they are uninsured or underinsured. Our active participation in the development of capitated reimbursement, specifically the local application of the incentives of capitation in our own practices and the development of new forms of collaborative care and resource management, needs to be coupled with a simultaneous commitment to extend health care access to all members of our society. Responsible efforts to manage health care efficiently and effectively will be an essential component of any system of universal access. Improving the management of health care resources for the insured should free resources to help care for the disenfranchised and allow society to more accurately calculate and manage the costs of providing universal health care.
Capitation affects all aspects of medical practice. It has the potential to clarify the boundaries between primary care physicians and their consulting subspecialist colleagues. It will certainly expand the financial risks faced by all practitioners. It will probably force changes in the allocation of health care resources, perhaps leading to a more accurate determination of true costs. Realistically, the necessary conditions for capitation to function as an acceptable and sustainable reimbursement model may never be achieved. Our task is to actively participate in the reengineering of health care delivery while maintaining our personal and professional standards in order to create a system that will work for everyone in our society.
The views expressed by Dr. Bierman do not necessarily represent the position of the Agency for Health Care Policy and Research or the Department of Health and Human Services.
Dr. Fein is the Co-Principal Investigator on Partnerships in Quality Education, funded in part by the Pew Charitable Trusts, Inc.
We want to acknowledge the assistance of Ms. Linda Paciulan in manuscript preparation. The following have reviewed and assisted in the preparation of this report: Drs. Andrew Bindman, Carolyn Clancy, Gordon Schiff, David Parish, Mark Leibow, Yen-Ping Chiang, and Mattew Wynia.