If you've been enrolled in a Medicare Advantage plan and recently received a letter saying your plan is leaving your area, you're not alone. Across the country, major insurers — including some of the largest names in the Medicare Advantage market — have been scaling back or completely exiting counties, regions, and in some cases entire states. The result is that millions of beneficiaries are being involuntarily disenrolled and must find new coverage, often with little time and significant confusion about their options.
The wave of insurer exits is being driven by financial pressure. Medicare Advantage plans are paid a fixed monthly amount per enrollee by the federal government, and in recent years, insurers have argued that rising medical costs — particularly for hospital stays, outpatient procedures, and specialty drugs — have made certain markets unprofitable. Companies including Humana, Aetna, and UnitedHealthcare have all announced reductions in their Medicare Advantage footprints for 2025 and 2026, with Humana alone exiting markets affecting hundreds of thousands of members. When a plan exits, it doesn't just inconvenience enrollees — it can disrupt established relationships with doctors, pharmacies, and specialists who were in-network under the old plan.
Here's what matters most if this is happening to you: federal rules require that your insurer notify you in writing before your plan terminates. That letter is critical. It triggers a Special Enrollment Period (SEP) that gives you a defined window — typically 60 days before and 60 days after your plan's termination date — to enroll in a new Medicare Advantage plan or return to Original Medicare (Parts A and B). You do not have to wait until the Annual Enrollment Period, which runs October 15 through December 7 each year. Your SEP is your lifeline, and missing it can leave you without coverage or locked into a plan that doesn't fit your needs.
When comparing replacement Medicare Advantage plans, don't just look at the monthly premium — many plans in 2026 still advertise $0 premiums, but the real costs are buried in copays, coinsurance, and out-of-pocket maximums that can reach $8,850 or more for in-network care under CMS rules. Check whether your current doctors, specialists, and preferred hospital are in the new plan's network. Confirm your prescriptions are covered on the new plan's formulary at a tier you can afford. And look carefully at any supplemental benefits — dental, vision, hearing, and transportation — that you may have relied on under your old plan, because these vary significantly between plans and insurers.
One of the most consequential decisions you'll face if your Medicare Advantage plan exits is whether to switch to another Advantage plan or return to Original Medicare paired with a Medigap (Medicare Supplement) policy. Original Medicare gives you broader provider access — nearly every doctor and hospital in the country that accepts Medicare — but it comes with no out-of-pocket cap, which is why most people pair it with a Medigap plan. The catch: in most states, if you left Original Medicare to join a Medicare Advantage plan and now want to come back, Medigap insurers can use medical underwriting to deny you coverage or charge higher premiums based on your health history. There are 13 states — including California, New York, Oregon, Illinois, and Maryland — that offer a birthday rule or other guaranteed-issue protections that may give you a window to enroll in Medigap without underwriting. If you live in one of these states, understanding that window could save you thousands of dollars annually.
For beneficiaries who decide to stay in the Medicare Advantage system and enroll in a new plan, use Medicare's Plan Finder tool at Medicare.gov to compare every plan available in your zip code. You can filter by your specific drugs, your doctors, and your budget. The tool shows star ratings — plans rated 4 stars or higher by CMS have generally demonstrated better care coordination, member satisfaction, and chronic disease management. A plan with a 2.5-star rating may cost less on paper but deliver a frustrating experience when you actually need care.
If you feel overwhelmed, free help is available. Every state has a State Health Insurance Assistance Program (SHIP), staffed by trained counselors who can walk you through your options at no cost and with no sales agenda. You can find your local SHIP contact through Medicare.gov or by calling 1-800-MEDICARE. These counselors are particularly valuable if you have complex health needs, take multiple medications, or are trying to navigate the Medigap underwriting question. Don't rely solely on insurance agents, who may only represent certain carriers and have a financial incentive to steer you toward specific plans.