As many as 2.9 million people enrolled in Medicare Advantage plans have been forced to find new coverage for 2026 after their insurers stopped offering plans in their counties. That figure, roughly one in ten Medicare Advantage enrollees, represents a tenfold increase over prior levels of forced disenrollment, according to researchers at the Johns Hopkins Bloomberg School of Public Health. The disruption falls hardest on seniors in rural areas and those enrolled in preferred provider organization plans run by smaller carriers, raising questions about the long-term stability of the private Medicare market.
A Tenfold Jump in Forced Disenrollment Hits Rural Seniors Hardest
The scale of this year’s exits is without recent precedent. The Johns Hopkins Bloomberg School of Public Health analysis found that 2.9 million enrollees face forced disenrollment in 2026, a tenfold increase compared with recent years. Those beneficiaries had no successor plan mapped to them through the federal crosswalk process, which in normal years automatically reassigns most members when a plan consolidates or restructures. In past cycles, only a small fraction of Medicare Advantage members ended up entirely on their own to pick new coverage; the new figures suggest a sharp break from that pattern.
The mechanism behind these exits is visible in the federal data itself. Each year, the Centers for Medicare & Medicaid Services (CMS) publishes plan crosswalk files that document how enrollees move from one contract to another when plans merge, terminate, or shrink their service areas. When a plan leaves a county entirely and no crosswalk mapping exists, affected members must actively choose a new plan or default back to traditional Medicare. That is exactly what happened to the 2.9 million enrollees identified in the Johns Hopkins research, who will receive termination notices rather than automatic transfer letters.
The hypothesis that smaller carriers running PPO networks in low-density counties are exiting at higher rates than national insurers aligns with the patterns described in the Johns Hopkins release. Rural counties and PPO plan types were identified as especially affected, suggesting that plans with higher provider network costs and more fragile contracting relationships are under the greatest strain. Smaller insurers typically have thinner margins and less ability to absorb payment-rate changes, making them more sensitive to shifts in federal reimbursement policy and to local changes in hospital or physician pricing.
CMS has already locked in the reimbursement framework that carriers used when deciding whether to remain in specific markets. In its final rule on 2026 payment updates for Medicare Advantage and Part D, the agency detailed the benchmarks, risk-adjustment refinements, and star-rating policies that will govern revenue next year. Carriers that concluded those rates made certain counties unprofitable chose to withdraw rather than operate at a loss, particularly where enrollee numbers were too low to spread fixed administrative costs or to negotiate favorable provider contracts.
Federal Enrollment Data Shows the Scope of County-Level Exits
The foundation for measuring the disruption sits in CMS’s own monthly enrollment reports, which track enrollment by contract, plan, state, and county. These files make it possible to identify exactly how many people were enrolled in plans that later terminated or reduced their service areas. Cross-referencing enrollment counts with the crosswalk files reveals which beneficiaries were left without an automatic path to a replacement plan and therefore face true forced disenrollment.
The exits also appear to concentrate among plans with relatively small county footprints. When an insurer offers only one or two products in a sparsely populated area, pulling back from that county can wipe out every private Medicare option that carrier provides locally. In many rural counties, beneficiaries were enrolled in just a handful of Medicare Advantage offerings to begin with, so the loss of even one carrier can dramatically shrink choice. In extreme cases cited by the Johns Hopkins team, all Medicare Advantage plans in a county are disappearing for 2026, leaving traditional Medicare as the only fallback.
The timing of these changes compounds the challenge for affected seniors. Plan terminations are being finalized months before the annual open enrollment period, but many beneficiaries may not fully understand their options until they receive official notices later in the year. Those who do nothing will generally revert to traditional Medicare, often without supplemental Medigap coverage and with different provider cost-sharing structures than they are used to under Medicare Advantage. For low-income enrollees and people with complex medical conditions, even short gaps in understanding coverage can translate into missed appointments or unexpected bills.
Policy analysts say the 2026 disruption underscores structural tensions in the Medicare Advantage program. The federal government relies on private plans to deliver extra benefits and care coordination, but those same plans can withdraw quickly when payment formulas or local market conditions shift. The clustering of exits among smaller PPO carriers in rural areas suggests that markets with fewer providers and higher unit costs are especially vulnerable. Unless future payment updates and oversight efforts explicitly account for geographic fragility, similar waves of terminations could recur.
For now, consumer advocates are urging regulators, state insurance departments, and community organizations to focus on outreach. Clear, early communication about plan exits, one-on-one counseling to compare alternatives, and targeted support for rural residents with limited internet access could help blunt the impact of the 2026 changes. But with millions of seniors already slated to lose their current coverage, the coming enrollment season is likely to test how resilient the Medicare Advantage system really is when market conditions turn.
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