1 in 10 Medicare Advantage Members Just Lost Their Plan: Here's What to Do Before Open Enrollment

If you're on a Medicare Advantage plan, the next few weeks of mail matter more than usual. Roughly 2.6 million people — about 13% of everyone in a Medicare Advantage plan with drug coverage — were in a plan that was terminated going into 2026. That's double the year before. And the pullback isn't over: carriers have already announced more market exits for 2027, which means another round of termination letters lands this fall. This article — from our Mission: Protected newsletter — is about what those letters mean and what to do about them, calmly and on schedule.

Going into 2026, the three biggest Medicare Advantage carriers all shrank their maps at once. Humana pulled out of roughly 200 counties and now covers a meaningfully smaller share of the country than it did in 2025. UnitedHealthcare exited counties across dozens of states, including its complete withdrawal from Vermont. Aetna closed nearly 90 individual plans across 34 states. Add the smaller carriers and you get that headline number: about 2.6 million people whose plan simply stopped existing on January 1.

Why? The economics moved. Medical costs — especially outpatient procedures and specialty drugs — rose faster than the government payments that fund these plans, and changes to the star-rating bonus system made some counties unprofitable to serve. When a county stops making financial sense, the carrier doesn't raise your premium; it non-renews the plan and leaves. None of that is your fault, and none of it is something you could have shopped your way around.

Every fall, two kinds of mail matter. The first is the Annual Notice of Change (ANOC), which every plan sends by September 30 — it lists next year's premium, copays, drug list, and network changes. The second, if your plan is ending, is a non-renewal or termination notice, which must reach you by early October. That's the one people mistake for marketing mail and throw away.

Before you react to either one, know which situation you're actually in:

• Termination / non-renewal: your plan ceases to exist in your county on December 31. You must choose something — a new Medicare Advantage plan, or Original Medicare plus a Part D drug plan.
• Consolidation (a "crosswalk"): the carrier is merging your plan into a sibling plan and will move you automatically. You don't lose coverage — but the new plan's network, drug list, and copays can differ, so "automatic" is not the same as "equivalent."
• Plan continues, terms change: the ANOC shows higher copays, a dropped doctor, or a re-tiered drug. The plan survives; whether it's still the right plan is a separate question.

When a Medicare Advantage plan is non-renewed or leaves your service area, you get more than the fall enrollment window:

• A Special Enrollment Period that runs beyond December 7 — from December 8 through the end of February — to pick a new Medicare Advantage or Part D plan if you need the extra time.
• In many cases, a guaranteed-issue right to buy certain Medigap (Medicare Supplement) policies with no health questions, for a limited window around your plan's end date. If you've ever wanted to move from Medicare Advantage back to Original Medicare with a supplement but worried your health history would price you out — this is the one moment the door opens on its own.
• If you do nothing, you'll generally be returned to Original Medicare on January 1 with no drug coverage — which means full-price prescriptions and a possible Part D late penalty later. "Wait and see" is the one option that actively hurts you.

This fall's letters won't just be about 2026 leftovers. Humana has announced targeted exits for 2027 affecting roughly 600,000 members, and the industry-wide pressure that drove the 2026 pullback hasn't gone away. Other major carriers have signaled they're prioritizing profitability over membership growth — but haven't announced specific county exits, so treat any "your carrier is leaving!" headline with suspicion until your own mailbox says so. The ANOC and any non-renewal notice for your plan are the only sources that matter for your decision.

If your plan is continuing, this is still the year to actually read the ANOC instead of filing it. Networks and drug lists moved more than usual across the industry, and a plan that was the right answer in 2024 can quietly become the wrong one by January without a single dramatic letter. Our open enrollment guide walks the full plan-review checklist for the October 15 – December 7 window.

A plan termination feels like the rug being pulled — but it's a paperwork event, not a health-coverage emergency, as long as you act inside the windows built for exactly this situation. The carriers made a business decision about your county. This fall, you get to make yours: a new Medicare Advantage plan chosen against your actual doctor and drug list, or Original Medicare with a supplement while the guaranteed-issue door is open.

The only losing move is the passive one — letting January 1 arrive with whatever the mail decided for you. If a letter shows up about your plan, or you just want to know whether yours is on solid ground before enrollment opens, bring it to someone who reads these notices for a living. That conversation is free.

Want more plain-English guides like this? Get ready for open enrollment, see what changed in Medicare for 2026, check whether you qualify for Extra Help and the Medicare Savings Programs, explore our free Medicare education center, or subscribe to Mission: Protected — where this article first appeared.