Government policy sometimes behaves like a home-improvement project that begins with replacing one loose cabinet hinge and ends with the entire kitchen sitting in the driveway. Medicare’s physician payment system offers a particularly expensive example.

The phrase “Medicare’s cobra effect” refers to a feedback loop in which rules intended to restrain spending can encourage behavior that raises costs elsewhere. The label comes from the famous, possibly embellished, story of colonial officials offering rewards for dead cobras. Enterprising residents allegedly began breeding snakes to collect the bounty. When the program ended, the breeders released their suddenly worthless inventory, leaving officials with more cobras than they had at the start.

Applied to Medicare, the analogy is not that doctors are gaming the system like cartoon villains with stethoscopes. The real problem is subtler: Medicare rewards individual billable services while using broad payment adjustments to contain aggregate costs. Clinicians, hospitals, and medical groups respond rationally to those incentives. More services are delivered, practices consolidate, facility fees appear, and the policy designed to control spending can help redirect care toward more expensive settings.

What Medicare’s “cobra effect” actually means

Traditional Medicare generally pays physicians and other clinicians through the Medicare Physician Fee Schedule. The schedule covers thousands of services, including office visits, imaging, diagnostic tests, therapy, and surgical procedures. Each service receives a relative value based on the work involved, the cost of operating a practice, and malpractice expenses.

Those relative value units, commonly called RVUs, are adjusted for geographic differences and multiplied by a dollar-based conversion factor. The resulting number becomes the Medicare-approved payment. It is an impressive feat of administrative engineeringroughly what would happen if a spreadsheet earned a medical degree.

Budget neutrality enters the picture when CMS changes the relative values assigned to existing services. If those revisions would increase or decrease estimated Physician Fee Schedule spending by more than $20 million, CMS generally must offset the difference. An increase in the work RVUs for one category can therefore produce a reduction in the conversion factor applied broadly across the schedule.

This distinction matters: budget neutrality is not a hard cap on total Medicare physician spending. It is primarily a mechanism for preventing changes in relative valuations from automatically enlarging or shrinking the fee-schedule pool. Actual spending can still rise when beneficiaries receive more services or more intensive services. MedPAC has cautioned that looking only at the conversion factor can create a misleading picture because total spending also reflects RVUs, utilization, coding, and service intensity.

How a cost-control policy became a feedback loop

National restraint creates weak individual restraint

The roots of today’s system reach back to the Omnibus Budget Reconciliation Act of 1989 and the introduction of a resource-based fee schedule in 1992. Early versions attempted to connect annual payment updates to practice costs while restraining growth in the volume and intensity of physician services. The Volume Performance Standard was later replaced by the Sustainable Growth Rate formula, or SGR.

The flaw was straightforward. A nationwide spending target gave each individual physician little reason to reduce volume. One practice could sacrifice revenue by ordering fewer services, but its restraint would barely move national spending. The financial benefit of moderation was shared across the country, while the financial cost landed directly on that practice. Economists call this a collective-action problem. Doctors might call it “a fine way to go broke politely.”

Congress repeatedly intervened to prevent large SGR payment reductions before replacing the formula through the Medicare Access and CHIP Reauthorization Act of 2015. Yet the underlying tension survived: Medicare still pays mainly for discrete services, while policymakers want clinicians to prevent illness, coordinate care, and reduce unnecessary utilization.

Lower unit payments can encourage higher volume

When the revenue from each service fails to keep pace with operating expenses, practices have only a limited menu of responses. They can see more patients, deliver more billable services, reduce staffing, shorten appointment times, stop accepting certain patients, charge additional membership fees, sell the practice, or close.

Not every clinician responds by increasing volume, and more care is not automatically unnecessary care. Medicare beneficiaries are older and often have multiple chronic conditions requiring frequent treatment. Still, fee-for-service payment makes additional visits and procedures the clearest route to additional revenue. Time spent answering a caregiver’s message, coordinating with a pharmacist, or preventing a hospital admission may receive little or no payment unless it fits a recognized billing code.

This arrangement particularly disadvantages primary care. A procedural specialist may be able to increase revenue through additional tests or interventions. A family physician cannot manufacture a second hour inside a 60-minute clock. Research and policy analyses have repeatedly found that the United States invests relatively little in primary care and that small practices need upfront funding, staff, and technical support to participate successfully in value-based models.

Budget-neutral redistribution creates winners and losers

When CMS raises the relative value of one group of services, budget neutrality may reduce the conversion factor for nearly everyone. The policy can improve payment for historically undervalued work, such as complex office visits, while lowering rates for services elsewhere.

That is not necessarily bad policy. Rebalancing payments toward evaluation, prevention, and chronic-disease management can be entirely reasonable. The cobra effect appears when the redistribution is layered onto rising wages, rent, insurance, technology, and administrative costs without a stable method for updating the overall payment pool.

Practices then experience an annual ritual: CMS proposes a conversion-factor reduction, medical societies warn of an access crisis, Congress debates temporary relief, and clinicians remain unsure what they will be paid next year. This is not long-term payment reform. It is health policy performed as seasonal theater.

Consolidation can move care into more expensive settings

Independent practices facing weak margins may sell to hospitals, health systems, or private-equity-backed organizations. AMA survey data show that 42.2% of physicians worked in private practices in 2024, down from 60.1% in 2012. About 34.5% worked in hospital-owned practices in 2024. Those numbers do not support claims that nearly every American physician is already employed by a hospital, but they do confirm a significant ownership shift.

After a hospital acquires a physician office, some services may be billed under hospital outpatient payment rules. Medicare can then pay both a professional fee and a separate facility payment. GAO has found that consolidation may increase Medicare spending when services migrate from physician offices to higher-paid hospital settings. Commercial insurers may also pay higher negotiated prices to consolidated systems with greater market power.

The same examination room may contain the same chair, the same blood-pressure cuff, and possibly the same ancient magazine. Yet the ownership change can alter how the visit is billed. That is the health care equivalent of charging resort fees because someone replaced the sign outside.

Is Medicare physician payment really causing a national access crisis?

The alarming version of the argument needs qualification. Medicare physician payment is under pressure, but the evidence does not show a universal collapse in access.

MedPAC reported that the Medicare program and beneficiaries paid approximately $93.8 billion for Physician Fee Schedule services in 2024, accounting for just over 15% of traditional fee-for-service Medicare spending. Its latest indicators found that access to clinician care was generally positive and often comparable with or better than access reported by privately insured people.

KFF found that only about 1.2% of non-pediatric physicians had formally opted out of Medicare as of November 2024. Earlier national data also showed that most office-based physicians accepted new Medicare patients. Access problems are more pronounced in certain specialties, particularly psychiatry, and in rural or underserved communities.

The fairest conclusion is that Medicare is not facing one uniform physician-access crisis. It faces a collection of local and specialty-specific pressure points. Primary care, behavioral health, rural medicine, and small independent practices may experience much greater strain than national averages reveal.

Workforce projections add urgency but should not be blamed entirely on Medicare payment. The AAMC projects a national physician shortage of up to 86,000 doctors by 2036, driven by factors that include population growth, aging patients, retirement among physicians, training capacity, specialty choices, and geographic maldistribution. Medicare reimbursement is one piece of that puzzle, not the entire jigsaw box.

Why focusing only on physician fees misses the bigger cost problem

Medicare physician reimbursement deserves reform, but it is not the largest source of American health spending. CMS estimates that total national health expenditures reached $5.3 trillion in 2024. Hospital spending accounted for approximately $1.63 trillion, while physician and clinical services represented about $1.11 trillion. Retail prescription drug spending reached roughly $467 billion.

Cutting a conversion factor while ignoring hospital prices, drug spending, administrative complexity, and site-of-service differences is like trying to lighten an airplane by removing the peanuts. The peanuts may weigh something, but they are not why the aircraft weighs 175,000 pounds.

Payment policy can also shift costs rather than eliminate them. An independent practice that becomes financially unsustainable may be acquired by a hospital. Medicare’s professional payment may remain constrained, yet total spending rises because facility payments are added. Employers and commercially insured families may face higher prices after consolidation. The cost has not disappeared. It has changed costumes.

How policymakers can defang Medicare’s cobra effect

Provide predictable updates tied to practice costs

Congress could replace unstable annual updates with a predictable formula tied to a portion of the Medicare Economic Index, which measures changes in clinicians’ input costs. MedPAC has recommended inflation-linked updates while balancing practice stability against premiums, beneficiary cost sharing, and Medicare’s long-term finances.

Predictability matters almost as much as the percentage itself. A medical practice cannot sensibly hire nurses, sign leases, or invest in technology when its future revenue depends on whether Congress passes a temporary adjustment during the year-end legislative scramble.

Strengthen primary care without writing a blank check

Primary care needs payment for work that happens between visits: medication management, caregiver communication, follow-up after hospitalization, coordination with specialists, and outreach to patients who miss care.

A hybrid model could combine a monthly risk-adjusted payment for core primary care services with limited fee-for-service payments and bonuses tied to meaningful outcomes. Recent analyses suggest that alternative payment models paying primary care practices directly can improve measures of access and comprehensiveness, particularly when practices receive resources without being forced immediately into excessive financial risk.

Expand value-based care, but install guardrails

Moving away from pure fee-for-service does not mean replacing one cobra with a slightly more corporate cobra. Full capitation creates its own incentive to reduce services, avoid medically complex patients, or shift costs outside the payment arrangement.

Any capitated or population-based system therefore needs accurate clinical and social-risk adjustment, transparent quality measures, patient-choice protections, appeals, monitoring for delayed care, and audits for selective enrollment. Value-based care must reward better outcomesnot simply fewer claims.

There is evidence that carefully designed models can work. CMS reported that Medicare Shared Savings Program accountable care organizations saved Medicare approximately $2.5 billion relative to benchmarks in performance year 2024. Physician-led, lower-revenue, and primary-care-heavy ACOs generated stronger per-person savings than many hospital-led organizations. Those results are encouraging, although benchmarks and program design still require scrutiny.

Adopt site-neutral payments where appropriate

Medicare should generally avoid paying dramatically different amounts for the same routine service solely because a hospital owns the building. Site-neutral payment would reduce incentives to acquire physician practices simply to convert ordinary office care into hospital outpatient billing.

Exceptions may be appropriate when a facility genuinely maintains emergency capacity, specialized staffing, or other resources required for medically complex care. The goal is not to pretend every setting is identical. It is to stop ownership paperwork from functioning like a medical procedure.

Support practices during the transition

Small practices cannot transform themselves with inspirational webinars and a 94-page reporting manual. They need upfront capital, interoperable data, care-management staff, technical assistance, and gradual exposure to financial risk.

Without transition support, large health systems will be best positioned to enter value-based contracts, while independent practices fall further behind. A reform intended to reduce consolidation could accidentally accelerate itanother cobra effect waiting patiently in the basket.

Conclusion: Better incentives, not just different formulas

Medicare’s payment problem is not simply that physician rates are too low or that doctors provide too many services. It is that the system asks fee-for-service medicine to produce population-health results while continuing to reward billable volume.

Budget neutrality has a legitimate purpose. Medicare cannot allow every increase in a service’s relative value to expand spending automatically. But annual conversion-factor adjustments, weak support for primary care, payment differences across sites, and unpredictable congressional patches combine to create distorted incentives.

The solution is not to abandon cost control. It is to control costs intelligently: update payments predictably, invest in primary care, reduce unjustified facility-price differences, test hybrid payment models, protect medically complex patients, and measure outcomes that matter. Otherwise, policymakers will continue paying people to catch snakes while acting surprised that the snake population keeps growing.

Experiences from the front lines: What the cobra effect feels like

The patient experience: Consider an older adult managing diabetes, heart failure, arthritis, and eight prescription medications. She does not necessarily need more appointments. She needs one clinical team with enough time to reconcile her medications, speak with her cardiologist, check whether she can afford her prescriptions, and call after a hospital discharge.

Under fee-for-service payment, much of that coordination is difficult to finance. Her primary care appointment may be shortened because the practice must fit more billable visits into the day. Questions that could have been handled through coordinated outreach become separate appointments. When her physician’s office is acquired by a hospital, she may continue seeing the same doctor in the same location but encounter a new facility charge. From her perspective, nothing changed except the billand perhaps the logo on the coffee mug.

The independent-practice experience: Picture a four-doctor family medicine group. Staff wages, rent, cybersecurity, medical supplies, liability coverage, and electronic-record expenses rise. Medicare payment updates do not reliably match those costs. The physicians try adding annual wellness visits, chronic-care codes, and longer hours, but every new billing category brings documentation rules.

The practice eventually faces three choices. It can reduce the number of Medicare patients, introduce a membership fee, or sell to a larger organization. None of those options necessarily reflects greed. The doctors may simply want enough revenue to retain nurses, answer messages, and leave the office before their children graduate from college.

If the group sells to a hospital, the doctors gain negotiating power, administrative support, and financial stability. The community, however, may lose an independent competitor. Some services may migrate to higher-cost hospital settings. The doctors survive, but the health system becomes more consolidated and total spending may rise.

The specialist experience: A specialist employed by a large organization may be evaluated partly through RVU productivity. Even when no one explicitly orders unnecessary treatment, the scoreboard sends a message: procedures generate visible units, while an hour spent reviewing records or discussing conservative treatment may not.

The physician learns to document more carefully, schedule follow-ups, and keep the procedure suite busy. Each decision can be clinically defensible. Yet across thousands of clinicians, small responses to payment incentives accumulate into major spending changes. The cobra effect rarely arrives wearing a name badge that says “unintended consequence.” It arrives as a normal Tuesday.

The value-based-care experience: Now imagine the family practice receiving a predictable monthly payment for each patient, adjusted for medical complexity. The group hires a nurse care manager and a part-time pharmacist. Patients receive follow-up calls after discharge. Blood-pressure readings can be reviewed remotely. A social worker helps arrange transportation before missed appointments become emergency-room visits.

The model feels closer to how clinicians say they want to practice, but it introduces new concerns. Is the payment sufficient for medically complex patients? Are quality measures meaningful? Could the group be penalized because its patients face poverty, unstable housing, or limited transportation? Does reducing utilization represent better prevention or delayed care?

These experiences explain why no single payment formula is magical. Fee-for-service encourages volume. Capitation can encourage underservice. Hospital ownership can provide stability while raising prices. Independent practice can preserve competition while struggling to finance coordination. Good policy does not eliminate incentives; it aligns them, monitors them, and adjusts before somebody starts breeding cobras.

Editorial note: The experiences above are illustrative composites based on recurring issues described in Medicare, physician-workforce, primary-care, and health care consolidation research. They are not quotations from, or descriptions of, identifiable patients or clinicians. Research for this article synthesized material from CMS, MedPAC, GAO, KFF, the AAMC, the AMA, the Commonwealth Fund, and U.S.-based medical policy publications.