A Medicare Advantage card can stay valid while the hospital printed nowhere on it quietly disappears from the plan’s network. When a health system terminates its insurer contract in the middle of the plan year, the members left behind keep paying the same premium but lose in-network access to the doctors their care was built around. Becker’s Hospital Review counted 25 U.S. health systems dropping at least some Medicare Advantage contracts in 2026, and the financial exposure that follows is larger than most enrollees expect. The protections many assume will soften the blow are narrower than the plan marketing implies.
Why the Advertised Out-of-Pocket Cap Stops Doing Its Job
Every Medicare Advantage plan advertises a maximum out-of-pocket limit, and that number does real work — but only for covered care delivered under the plan’s own network rules. Once a hospital leaves the network, treatment there shifts into a costlier category, and on many plans the ceiling that applies is a different, much higher one.
Federal rules for 2026 allow in-network out-of-pocket spending up to $9,250, with a separate combined limit as high as $13,900 once out-of-network care is added, according to KFF’s 2026 Medicare Advantage analysis. In practice the averages sit lower: about $5,421 for in-network care and roughly $9,825 once out-of-network spending counts against a PPO’s combined ceiling. A provider exit can therefore nearly double the ceiling a serious illness runs into over a single year. On an HMO, routine care sought outside the network is generally not covered at all, leaving the member responsible for the full charge, while emergency and urgent care stay protected.
Two features baked into Advantage plans deepen the exposure. The first is prior authorization: KFF’s analysis found that virtually every enrollee sits in a plan that requires advance approval for at least some services, and a hospital’s mid-year exit can strand a pending request, forcing a fresh authorization through a different in-network facility before treatment resumes. The second is balance billing. A hospital no longer under contract is not bound by the plan’s negotiated rates, so beyond the higher out-of-network cost sharing, it may bill the member for the difference between its list charge and what the plan allows — a gap with no ceiling of its own.
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The 90-Day Rule Covers Less Than Its Name Suggests
Many enrollees believe a federal 90-day continuity rule will keep a departing doctor in place. That protection, set out in 42 CFR 422.112, actually applies to someone who joins a new Medicare Advantage plan while already mid-treatment — it stops the new plan from abruptly cutting off that course of care. It does not create an automatic extension every time a provider walks out of a member’s current plan.
What the rules do require is notice. Plans must alert affected members before a contracted provider leaves, generally at least 45 days ahead for a primary care or behavioral health provider and 30 days for other specialists and facilities. A plan may still approve transitional care under its own policies, and the notice must explain how to request it. The No Surprises Act’s continuing-care provisions, by contrast, do not reach Medicare Advantage, because Medicare programs run on their own rulebook. A separate rule can help when the remaining network genuinely cannot meet a medical need: the plan must then arrange out-of-network care at in-network cost sharing — an argument that carries more weight for a specialized cancer treatment than for keeping a familiar primary care doctor.
Two practical safeguards sit alongside that notice. Plans must keep their provider directories accurate, so a member deciding whether to stay should confirm which remaining in-network hospitals and specialists can actually accept the case — a directory listing is not proof of an open panel. And every state runs a free State Health Insurance Assistance Program, federally funded counseling that will read a specific termination letter and lay out the choices at no cost.
Leaving Advantage for Original Medicare Is Not a Clean Exit
A provider’s departure does not by itself open a Special Enrollment Period. Federal regulators may authorize one when a network change is judged significant, but the termination letter alone should not be read as an open door. Absent that, the next dependable chance to switch is the Annual Enrollment Period that runs October 15 through December 7, with new coverage effective January 1.
Returning to Original Medicare is permitted during an applicable enrollment window, and Original Medicare imposes no provider network, as the program’s own cost basics lay out. The catch is the supplement. Once the one-time six-month Medigap enrollment window has closed, insurers in most states may medically underwrite a Medigap application, which can mean a higher premium or an outright denial. A hospital leaving an Advantage network does not, on its own, create a federal guarantee that a Medigap insurer must accept the applicant.
Timing offers one opening the fall window can obscure. The Medicare Advantage Open Enrollment Period, which runs January 1 through March 31 each year, lets a current Advantage member switch to a different Advantage plan or drop back to Original Medicare and add a stand-alone Part D drug plan, per Medicare’s enrollment rules. That escape hatch does nothing about Medigap underwriting, though. One narrow federal protection can: a member who first joined Advantage when initially eligible for Medicare, and is still inside the first twelve months, holds a trial right to return to Original Medicare with a guaranteed-issue Medigap policy and no health questions. Outside that window, the guarantee generally disappears.
The Three Conversations a Termination Letter Starts
The letter effectively opens three tasks, each worth handling in writing. The first is a request to the current plan to continue active treatment, naming every scheduled procedure, prior authorization, and specialist, and asking for a written decision on what will be covered and through what date. The second is a call to 1-800-MEDICARE to ask whether regulators have approved a significant-network-change enrollment period tied to the termination. The third is securing written Medigap approval before dropping Advantage, rather than acting on an estimate, so the switch does not close one door before another opens. The hospital and insurer can end their relationship with a single notice; the patient still has to rebuild coverage one doctor at a time.
This article was created with AI assistance and was reviewed, edited, and fact-checked by The Financial Wire editorial team.
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David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
