The Medicare Physician Fee Schedule, commonly called the PFS, is the system Medicare uses to determine how much it pays doctors and other clinicians for the services they provide to Medicare beneficiaries. Published as a final rule by the Centers for Medicare & Medicaid Services (CMS) each year, the PFS assigns a relative value to every covered medical service, then multiplies that value by a dollar amount called the conversion factor to arrive at a payment rate. It replaced an older charge-based system in 1992 and now sets prices for roughly 10,000 distinct billing codes, affecting not just Medicare patients but the broader health-care payment landscape as well.
How the Fee Schedule Replaced the Old System
Before 1992, Medicare paid physicians based on what was known as the customary, prevailing, and reasonable (CPR) charge system. Under CPR, a doctor’s reimbursement was tied largely to what that doctor and peers in the same area had historically charged for a given service. The result was a payment structure that varied widely by geography and specialty, and one that tended to reward procedural work far more generously than cognitive or evaluation-based care. The resource-based relative value scale (RBRVS) was introduced in 1992 to replace CPR, shifting Medicare toward payments grounded in the actual resources a service requires rather than whatever a physician happened to bill.1PubMed. Physician rewards for different kinds of service: the RBRVS versus the CPR system
The transition was intentionally redistributive. Analyses at the time found that the new fee schedule would shift payments away from surgeons, radiologists, and other procedure-heavy specialties and toward primary care.2Health Policy. The medicare fee schedule unveiled: An account of physician payment reform That redistribution remains one of the most debated features of the system three decades later, and it continues to shape how different types of doctors experience Medicare reimbursement.
The Three Components Behind Every Payment
Each medical service billed under the PFS is assigned a set of relative value units, or RVUs. These RVUs are not dollar amounts themselves. They are weights that reflect the resources consumed to deliver a particular service, and they are divided into three categories.
- Physician work: This captures the time, skill, mental effort, judgment, and stress involved in performing a service. A complex brain surgery carries a much higher work RVU than a routine office visit.
- Practice expense: This accounts for the overhead costs of delivering care, including clinical staff wages, office rent, medical supplies, and equipment. Practice expense RVUs differ depending on whether a service is performed in a doctor’s own office or in a hospital outpatient department.
- Malpractice expense: This reflects the professional liability insurance cost associated with each service. Specialties with high litigation risk, like obstetrics or neurosurgery, carry higher malpractice RVUs.
Each of these three components is adjusted by a geographic practice cost index (GPCI) that accounts for regional differences in the cost of living, office space, and malpractice premiums. A cardiologist in Manhattan and a cardiologist in rural Iowa may perform the identical procedure, but their geographic adjustments differ. Once the adjusted RVUs for all three components are summed, that total is multiplied by the conversion factor, a single dollar figure CMS publishes each year, to produce the final payment amount.
The practice expense component has been a particular source of debate. Historically, practice expense RVUs were based on historical physician charges rather than the actual cost of running a practice. Researchers have proposed resource-based methods for determining practice expense, arguing that the payment for practice expense should reflect the actual proportion of a physician’s revenue consumed by overhead.3PubMed Central. Allocating practice expense under the Medicare fee schedule CMS has moved in this direction over the years, but practice expense valuation remains contested because overhead varies enormously across practice settings.
The Role of the RUC
CMS does not value every one of those 10,000 billing codes from scratch each year. It relies heavily on recommendations from a group called the RVS Update Committee, or RUC, which is convened by the American Medical Association. The RUC submits recommended reimbursement values for physician work RVUs under Medicare Part B.4PubMed Central. Committee Representation and Medicare Reimbursements-An Examination of the Resource-Based Relative Value Scale
CMS accepts the RUC’s recommendations the vast majority of the time, which gives the committee outsized influence over how Medicare dollars flow. Critics have long pointed out that the RUC’s membership skews toward procedural specialties, potentially perpetuating higher valuations for procedures relative to the cognitive, face-to-face work that primary care physicians do. Supporters counter that the RUC brings clinical expertise that CMS staff alone could not replicate. Either way, if you have ever wondered why a 15-minute office visit reimburses at a fraction of what a 15-minute procedure does, the RUC’s valuation process is a big part of the answer.
Budget Neutrality and Why the Conversion Factor Keeps Falling
One of the most consequential features of the PFS is a statutory requirement that it remain budget neutral. By law, the total pool of Medicare physician spending cannot simply grow because CMS raises the RVUs for certain services. If the overall volume of services increases or if RVUs for particular codes go up, compensating reductions must happen elsewhere, either through cuts to the conversion factor or through lowered RVUs for other services.5PubMed. Budget Neutrality and Medicare Physician Fee Schedule Reimbursement Trends for Radiologists, 2005 to 2021
In practice, this has worked like a ratchet that pushes individual payments down over time. As the Medicare population has grown and the total volume of services has expanded, the budget neutrality requirement has forced persistent inflation-adjusted decreases in the conversion factor.6INQUIRY: The Journal of Health Care Organization, Provision, and Financing. Medicare Volume Growth and Shift in Payments From Physicians to Non-Physician Practitioners Under Statutory Budget Neutrality Add to that statutory freezes in physician payments during certain years, and the result is that the amount Medicare pays per unit of work has not kept pace with general inflation. Physicians often describe this as getting paid less each year for the same work, and in real-dollar terms, that is essentially what has happened.
Congress has occasionally stepped in to override scheduled cuts, most dramatically when it repeatedly delayed automatic reductions under the now-repealed sustainable growth rate (SGR) formula. The replacement law, MACRA, eliminated the SGR but introduced its own set of modest annual updates that many physicians argue are still well below the rate of medical inflation.
How MACRA and the Quality Payment Program Tie into the PFS
The Medicare Access and CHIP Reauthorization Act of 2015 did more than replace the SGR. It created the Quality Payment Program (QPP), which layers performance-based adjustments on top of the standard fee schedule payments. Under QPP, clinicians participate in one of two tracks: the Merit-Based Incentive Payment System (MIPS) or an advanced alternative payment model (APM).7PubMed. MACRA, MIPS, and the New Medicare Quality Payment Program: An Update for Radiologists
MIPS evaluates clinicians on quality measures, cost, improvement activities, and the use of health information technology. Based on their composite scores, clinicians receive either a positive or negative adjustment to their fee-schedule payments. In a good performance year, a doctor might receive a few percentage points of bonus on top of standard PFS rates. In a poor year, payments can be reduced by an equivalent amount. The system is designed to be budget neutral within its own track as well, meaning bonuses to high performers are funded in part by penalties on low performers.
Advanced APMs offer an alternative path. Clinicians who participate in qualifying models, such as certain accountable care organizations, can earn lump-sum incentive payments and are exempt from MIPS reporting. CMS published the formal criteria for these models in a final rule that also laid out the specifics of the MIPS scoring methodology.8Federal Register. Medicare Program; Merit-Based Incentive Payment System (MIPS) and Alternative Payment Model (APM) Incentive Under the Physician Fee Schedule, and Criteria for Physician-Focused Payment Models The annual PFS rule is the vehicle through which CMS updates MIPS thresholds, measure sets, and reporting requirements, so reading the PFS final rule each year is unavoidable for practice administrators trying to maximize their reimbursement.
Non-Physician Practitioners and the 85 Percent Rule
The PFS does not apply only to physicians. Nurse practitioners, physician assistants, and clinical nurse specialists can also bill Medicare under the fee schedule, though at a reduced rate. Payment for these non-physician practitioners is set at 85 percent of the physician fee schedule amount. Specifically, Medicare pays 80 percent of the lesser of the actual charge or 85 percent of the physician rate.9Noridian Healthcare Solutions. Medicare Physician Fee Schedules (MPFS) – JE Part B
This 85 percent differential has become increasingly significant as Medicare enrollment grows and workforce shortages push more care delivery to advanced practice providers. Critics of the differential argue that nurse practitioners and physician assistants often provide functionally identical office visits and should be reimbursed at the same rate. Supporters of the current structure contend that the differential reflects differences in training and scope. Regardless of where you land on that debate, the practical result is that practices relying heavily on non-physician clinicians receive less per visit from Medicare, which affects staffing decisions, patient access, and how a practice’s finances work.
There is an important wrinkle for physician assistants: Medicare can only pay a PA’s employer, not the PA directly. If a PA operates as an independent contractor, the arrangement must qualify as an employment relationship for the payment to go through. This billing structure can influence how practices hire and contract with PAs.
How the PFS Changes Documentation and Coding
The PFS rule is not just about dollar amounts. CMS uses the annual rulemaking process to update documentation requirements, coding definitions, and administrative policies. One of the more significant recent changes targeted evaluation and management (E/M) codes, the billing codes used for standard office visits. In the 2019 PFS final rule, CMS finalized changes to reduce the documentation burden for office and outpatient E/M services, as well as for teaching physician documentation.10AAP Pediatric Coding Newsletter. Medicare Changes to Reduce Evaluation and Management Documentation Burden
Before these reforms, physicians often complained that they spent more time documenting the medical decision-making process to justify a billing level than they did actually talking to the patient. The revised framework, which rolled out in stages, allows clinicians to select the level of an office visit based on either medical decision-making or total time, rather than a rigid checklist of history and physical exam elements. For patients, this change was invisible, but for physicians and their staff it was one of the more meaningful administrative simplifications in years.
Telehealth Provisions in the PFS Rule
The PFS rule also governs which telehealth services Medicare covers and under what conditions. Before the COVID-19 pandemic, telehealth coverage under Medicare was narrow. Patients generally had to be located in a rural area and physically present at an approved originating site, such as a clinic, for a telehealth visit to be reimbursable. The pandemic prompted Congress and CMS to temporarily waive many of those restrictions, greatly expanding the list of telehealth-eligible services and allowing patients to receive care from home.11Telehealth and Medicine Today. Medicare telehealth pre- and post-COVID-19: interstate framework, regulations, licensure, and HIPAA
Many of those waivers were initially temporary, but CMS has used subsequent PFS rules to make some telehealth flexibilities permanent while letting others expire. Each year’s proposed and final PFS rules now include detailed lists of which services can be furnished via telehealth, whether audio-only visits qualify, and what billing modifiers must be used. For practices that invested heavily in virtual care platforms during the pandemic, the telehealth sections of the annual PFS rule determine whether those services remain financially viable under Medicare.
How Physicians Respond to Fee Changes
A persistent question in health economics is what happens when Medicare cuts (or raises) its fees. Economists have found that doctors do not simply absorb cuts passively. Research on physicians who experienced income reductions from Medicare fee changes showed that those hit hardest increased the volume of services they performed, in both their Medicare and private-payer caseloads.12PubMed. Physician response to Medicare fee reductions: changes in the volume of coronary artery bypass graft (CABG) surgeries in the Medicare and private sectors An earlier study estimated that for every dollar cut in fees, physicians who lost income recouped roughly 40 cents by increasing the number of services they delivered.13PubMed Central. Physician behavioral response to a Medicare price reduction
More recent research has found that physicians who continued practicing in office settings showed some tendency to increase service volume in response to lower reimbursement rates.14PubMed Central. Physician responses to Medicare reimbursement rates This volume response matters for several reasons. It means that fee cuts do not save Medicare as much money as a straightforward calculation would suggest, because physicians partially offset lower per-service payments by billing for more services. It also raises questions about whether the additional services are clinically necessary or represent a form of demand inducement. The behavioral responses also vary by specialty, which means a uniform fee cut can have unpredictable effects across different areas of medicine.
Why Private Insurance Cares About the PFS
Even if you are not on Medicare, the PFS affects you. Private insurers frequently use Medicare’s fee schedule as a reference point when negotiating their own payment rates with physicians. Research examining a large administrative change in Medicare reimbursements found that private prices follow Medicare’s lead to a striking degree: a one-dollar increase in Medicare’s fees was associated with a $1.16 increase in the corresponding private-insurer price.15PubMed Central. In the Shadow of a Giant: Medicare’s Influence on Private Physician Payments
This spillover effect makes the PFS something like a price-setting benchmark for the entire physician payment market. When CMS revalues certain codes, perhaps boosting primary care visits relative to imaging, private insurers often make similar shifts in their own fee schedules. It also means that the debates that play out in the annual PFS rulemaking process, which codes get revalued, how much the conversion factor moves, and what new services are covered, ripple well beyond the Medicare population. Employers, commercial plan enrollees, and even uninsured patients who negotiate self-pay rates all feel the downstream effects of decisions made in the PFS rule.
Reading the Annual PFS Rule
CMS publishes a proposed PFS rule each summer and a final rule in late fall, typically effective January 1 of the following year. The proposed rule invites public comment, and CMS receives thousands of responses from physician societies, hospital associations, patient advocacy groups, insurers, and individual clinicians. Changes between the proposed and final rule are common, sometimes dramatically so for specific billing codes or policies.
The final rule itself is enormous, routinely running over a thousand pages in the Federal Register. Most physicians never read it cover to cover. Instead, specialty societies and practice management consultants distill the relevant changes for their audiences. For a family practice, the sections on E/M coding and MIPS scoring might be most important. For an interventional radiology group, the revaluation of specific procedural codes and the practice expense methodology may matter more. The rule’s scope is so broad that nearly every type of clinician who bills Medicare will find something in it that affects their daily work and their bottom line.
If you are a patient, you are unlikely to read the PFS rule either, but its effects reach you in indirect ways. When your doctor’s office decides to stop accepting new Medicare patients, it may be because the PFS rates no longer cover the cost of delivering care in that area. When your physician starts offering more telehealth appointments, it may be because the latest PFS rule expanded coverage for virtual visits. And when your insurer changes the copayment structure for an office visit, the ripple may trace back to a PFS code revaluation that shifted the underlying payment rate. The PFS rule is, in many respects, the plumbing of the American health-care payment system: invisible to most people, but the thing that determines where the money flows.