Insurers Expanded Control of Medicare Primary Care

The growth of payer-owned practices changes how independent clinics compete for patients and referrals.

Updated on Oct. 2, 2026 in Healthcare

Isometric editorial illustration featuring a clinic building nested within a structural geometric framework, representing corporate healthcare consolidation. — Insurers have significantly expanded their ownership of primary care clinics, now controlling over 4% of the Medicare market as of 2023. AI Illustration. Upload story photo >

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Health insurers significantly increased their ownership of primary care practices between 2016 and 2023. Payer-operated clinics now account for 4.2% of the national Medicare primary care market, as corporations move to capture federal per-enrollee payments.

Why it matters

Insurers acquire practices to manage patient costs and maximize Medicare Advantage reimbursements through diagnostic upcoding. This consolidation challenges the viability of independent practices that face a 33% decline in real physician payments over the last 25 years.

Payer-operated practices held 4.2% of the Medicare market in 2023, up from 0.8% in 2016. Across the U.S., 80% of physicians are now employed by corporations or health systems, leaving just 42% of doctors in private practice as of 2024.

The players

UnitedHealth Group

The parent company of Optum, a massive diversified health services firm that manages primary care clinics and physician networks.

American Medical Association

The national professional association representing physicians that provides advocacy and establishes policy stances for the medical industry.

Centers for Medicare & Medicaid Services

The federal agency responsible for administering the Medicare program and setting physician payment rates.

The details

Insurers utilize in-house clinics to steer members into their network, effectively capturing per-enrollee payments as profit. These entities also leverage their integrated data to increase federal reimbursements by diagnosing patients with more conditions through upcoding. This model contrasts sharply with traditional independent practice, which now accounts for a minority of the physician workforce.

2012: 25% of physicians were employed by hospitals or corporations.
2016: Payer-operated practices held 0.8% of the Medicare market.
2023: Payer-operated practices held 4.2% of the Medicare market.
2024: 42% of physicians worked in private practice.
June 2026: The American Medical Association adopted a policy opposing corporate control of medical practices.

Market Landscape

The expansion of insurer-owned clinics follows the structural incentives embedded in the Medicare Advantage program. This consolidation continues to narrow the operating space for independent practices as payers prioritize network control to maximize federal payment capture.

Operators in private practice should monitor local insurer activity, as payer-owned clinics now control more than 10% of the primary care market in over 15% of U.S. counties. Independent clinics must evaluate whether their current referral and patient retention strategies can withstand increased competition from integrated payer networks.

The takeaway

The consolidation of primary care by insurers is a structural effort to maximize capture of government payments. Operators should track local market concentration in their county to assess the competitive risk posed by payer-operated practices.