Is Your 2026 Medicare Hospital Still Taking Your Plan?

The Quiet Exits Reshaping Medicare in 2026

When a Medicare Advantage plan and a hospital system can't reach a contract agreement, the result is the same regardless of who walked away from the negotiation: the hospital becomes out-of-network for that plan's enrollees. For most beneficiaries, out-of-network care means higher out-of-pocket costs, prior authorization headaches, and in some cases full denial of coverage for non-emergency services.

The 2026 contract terminations have been remarkable in both scale and prestige. Rochester, Minnesota-based Mayo Clinic — one of the most recognized hospital brands in the world — went out of network with most Medicare Advantage plans from UnitedHealthcare and Humana. Boston-based Mass General Brigham, the system that includes Massachusetts General Hospital and Brigham and Women's Hospital, ended primary care network participation with UnitedHealthcare and Blue Cross Blue Shield Massachusetts MA plans. New York City's Mount Sinai went out of network with Anthem MA in January 2026. NewYork-Presbyterian — one of the largest hospital systems in the New York metropolitan area — ended its contract with UnitedHealthcare MA on May 1, 2026, after an extension of the original January deadline failed to produce an agreement.

The pattern extends well beyond elite academic medical centers. Tampa's Moffitt Cancer Center, a National Cancer Institute-designated comprehensive cancer center, ended its Aetna MA contract in December 2025 and is scheduled to go out of network with Humana MA in July 2026. Clearwater, Florida-based BayCare Health System is set to leave the UnitedHealthcare MA network on June 1, 2026. Houston's Memorial Hermann and Blue Cross Blue Shield Texas MA went out of network in January 2026. Chapel Hill-based UNC Health terminated contracts with Humana, WellCare, and Health Care Service Corporation MA plans in January 2026.

What these systems share is not geography — they're scattered across the country — but the reasons given for the exits. Hospital executives have publicly cited persistent frustrations with prior authorization denials, slow reimbursement from MA insurers, and the increasingly aggressive use of artificial intelligence by insurers to reject claims. A recent Senate investigation found that the three largest Medicare Advantage insurers — UnitedHealth, CVS, and Humana — are systematically using AI to deny post-acute care claims at rates 16 times higher than their overall denial rates. From a hospital's perspective, the math has gotten too painful: serving MA patients now requires significant administrative labor and produces unreliable payment. Our reporting on why prior authorization denials are reshaping Medicare Advantage walks through the broader pattern.

What "Out of Network" Actually Means for Your Care

The phrase "out of network" sounds technical, but its financial and practical consequences are anything but abstract. Understanding what it actually means for your care is the difference between informed planning and a surprise medical bill in the five-figure range.

For Medicare Advantage HMO plans, the most restrictive type, out-of-network care is generally not covered at all except in true emergencies — meaning if you go to an out-of-network hospital for a scheduled procedure, your plan may pay nothing. You would be responsible for the full bill. For Medicare Advantage PPO plans, out-of-network care is typically covered but at substantially higher cost-sharing rates: higher deductibles, higher copays, and higher coinsurance percentages. A hospital stay that would cost a few thousand dollars in-network can cost ten or twenty thousand dollars out-of-network even with PPO coverage.

Emergency care receives special protection. Federal law requires Medicare Advantage plans to cover emergency services at any hospital, regardless of network status. So if you have a heart attack or a stroke and the closest hospital is one that's been dropped from your plan, you can still receive emergency treatment without worrying that the hospital itself is "wrong." Where the problem typically arises is what happens after the emergency stabilizes — when continued inpatient care, follow-up visits, and rehabilitation begin, the network rules reassert themselves.

The other major exposure is for elective and scheduled care. A cardiologist appointment, a hip replacement, a scheduled diagnostic test, ongoing cancer treatment — all of these become problematic if the hospital where you receive them is no longer in-network. Patients in active treatment for cancer or chronic conditions face particularly difficult decisions, because changing providers mid-treatment can disrupt continuity of care in ways that affect outcomes. Our explainer on how Medicare Advantage HMO and PPO networks differ from Original Medicare covers what each structure means for hospital choice.

If Your Hospital Has Dropped Your Plan — What to Do Next

If you've made the calls and confirmed your preferred hospital is no longer in-network for your Medicare Advantage plan, you have more options than most people realize — but each one has timing considerations.

The first option is to determine whether you qualify for a Special Enrollment Period. CMS provides SEPs in certain circumstances that involve significant changes to plan networks, particularly when a contract termination affects a substantial portion of the plan's coverage area. If a major hospital system serving your area has left your plan, contact 1-800-MEDICARE and ask whether the situation qualifies you for an SEP to switch plans. The answer depends on specifics — the size of the network change, the timing, and your individual circumstances — but it's worth the call. Our guide to the 2026 Special Enrollment Period for misleading networks covers a related protection that may also apply.

The third option, available to everyone every year, is the Annual Enrollment Period from October 15 to December 7. This is the standard window for changing plans for the following year. If your hospital exit happened in 2026 and you're stuck with the plan until next year, the AEP is when you can make the move. During the months between now and October, document everything — bills, denials, communications with the plan and the hospital. That documentation can support either an earlier SEP request or, at minimum, an informed AEP decision.

The fourth and longest-term option is to consider returning to Original Medicare with a Medigap supplement and a standalone Part D plan. Original Medicare has no closed hospital networks, which means a hospital contract termination cannot affect your access if you're not in a Medicare Advantage plan at all. The trade-offs — higher monthly premiums, no built-in dental or vision benefits, the timing complications of Medigap medical underwriting — are real. But for someone whose hospital relationship is central to how they want to receive care, the structural protection is meaningful. Our overview of switching from Medicare Advantage back to Original Medicare with a Medigap plan walks through the underwriting timing.

This is not an exhaustive list — contract terminations continue throughout 2026. Verify your specific hospital's status directly. Sources: Becker's Hospital Review hospital contract tracker; 24/7 Wall St. Medicare coverage.

The Pattern Behind the Exits — and What It Means Going Forward

These hospital exits are not random. They reflect a deeper structural conflict between how Medicare Advantage plans operate and how hospitals deliver care — a conflict that has been building for years and is now visible at the contract negotiation level.

Hospitals describe an MA reimbursement environment that has steadily become more difficult. Insurers increasingly require prior authorization for procedures that previously didn't need it. Claim denials have risen, particularly for post-acute care like skilled nursing facility stays and rehabilitation. AI-driven claim review systems flag and reject more claims, requiring more administrative appeals to overturn. Payment timelines stretch. For hospital systems operating on thin margins, the combination becomes unsustainable.

Insurers describe pressure from their own side. Medical inflation has outpaced general inflation. The post-pandemic surge in deferred care drove utilization higher than projected. Federal payment formulas have tightened. Wall Street has punished insurers whose MA profit margins compressed. The pressure to control costs is intense, and prior authorization, claim review, and stricter network management are the tools insurers reach for.

The result is what patients are now experiencing: hospitals walking away from contracts, networks shrinking, and the trust that beneficiaries built into their Medicare Advantage decisions becoming less reliable. There is no quick fix. The forces driving the conflict are systemic.

What this means going forward, for Medicare beneficiaries, is that hospital and provider network verification has shifted from an annual chore to something closer to ongoing maintenance. The plan you chose two years ago, with the hospital you wanted, may not be the same plan today. Treating Medicare Advantage enrollment as a "set it and forget it" decision is no longer realistic. Annual review, mid-year verification calls when needed, and willingness to switch when networks shift have become part of what staying covered actually requires. Our Medicare resources directory lists state SHIP counselors who can help for free.

The hospital you trust is worth a phone call this week.

If the network churn has you weighing a return to Original Medicare, read What Does 2026 Medicare Plan G Actually Cover? first — the Medigap purchase is the part with a deadline.