Medicare Advantage Plan Ending in 2027: Act by Dec. 7

Published October 18, 2026. Medicare plan availability, premiums, formularies, and networks change every year. Verify your specific plan at Medicare.gov or with your State Health Insurance Assistance Program (SHIP). Educational information only — not insurance or financial advice.

Medicare Open Enrollment for 2027 runs October 15 through December 7, 2026. Most years, that is a comparison exercise: check the premium, check the drugs, keep the plan or switch.

This year is different for a lot of people. Insurers are exiting or shrinking their Medicare Advantage footprints for 2027, and when a plan does not renew, the decision stops being optional. If you do nothing, you can end up back on Original Medicare without drug coverage at the same time your old plan's network and extras disappear.

Here is how to tell whether your plan is affected, what happens if you miss the deadline, and how to compare your real options.

First: How to Tell If Your Plan Is Not Renewing

You may have already received the notice and set it aside. Three documents matter:

1. The Annual Notice of Change (ANOC). Plans must send this by September 30 each year. If your plan is leaving, the ANOC or a separate notice should say so. Read the first page, not the summary of benefits.
2. The Evidence of Coverage (EOC). This is the longer contract document. Look for language about non-renewal, plan termination, or a service-area reduction.
3. A letter from the plan or from Medicare. Non-renewal notices are supposed to be clear about the termination date and your options. If you are not sure, call the number on the back of your member card and ask one question: "Is this plan renewing for 2027?"

You can also verify plan availability for your ZIP code using the official Medicare Plan Finder. If your current plan does not appear for 2027, treat that as a signal to act.

Do not rely on the plan's marketing email. A plan can be sold or renamed, and the network can change even when the brand name does not. Check the contract year and the plan ID.

What Happens If You Do Nothing

If a Medicare Advantage plan does not renew, you should not assume you will be moved into another Advantage plan. Unless CMS has approved a formal consolidation that moves you into a successor plan, you generally return to Original Medicare (Parts A and B) when the plan ends.

That has three consequences:

• You lose the Advantage plan's extras — dental, vision, hearing, fitness benefits, and the specific provider network you chose.
• You have no Part D drug coverage unless you enroll in a standalone Part D plan. Going 63 days or more without creditable prescription drug coverage can trigger a late enrollment penalty that lasts as long as you have Part D.
• You may face medical underwriting for Medigap. Outside a guaranteed-issue window, an insurer can decline you or charge more based on health history.

The safety net is a Special Enrollment Period (SEP). For a plan that is not renewing for 2027, the SEP generally runs from December 8, 2026 through February 28, 2027. Use it. Do not wait for a letter to arrive in January.

Your Three Real Options

Option 1: Move to another Medicare Advantage plan

This keeps the all-in-one structure and often the lowest premium. Before you switch, check:

• Provider network — every doctor and hospital you actually use, not just the ones in the directory headline.

• Drug formulary — each prescription, its tier, prior-authorization rules, and quantity limits.
• Maximum out-of-pocket (MOOP) — the in-network and combined limits. A low premium with a high MOOP is not automatically cheaper.
• Prior authorization — which services require approval, and how often.
• Star rating and complaints — useful context, but not a substitute for checking your own providers and drugs.

Option 2: Return to Original Medicare + a standalone Part D plan

This gives you the broadest provider access and no network referrals. The trade-off is that Original Medicare has no out-of-pocket maximum for Part B services, so most people pair it with a Medigap policy. You will pay a Medigap premium plus a Part D premium, and you must check both.

Option 3: Original Medicare + Medigap + Part D

The most predictable-cost path, and usually the most expensive in premiums. It is also the option where when you enroll matters, because Medigap guaranteed-issue rights are narrow.

The Medigap Rule Most People Miss

If your Medicare Advantage plan leaves Medicare or stops serving your area, you generally have a guaranteed-issue right to buy certain Medigap policies — insurers cannot turn you down or charge you more because of health status during that window. The window is generally 63 days before through 63 days after your coverage ends, and the available plans and rules vary by state.

If you miss that window, you can still apply for Medigap, but the insurer may underwrite the policy. That is the difference between a predictable premium and a declined application.

One more nuance: if you try Medicare Advantage and decide to return to Original Medicare within your first 12 months, you may have a trial right to buy a Medigap policy without underwriting. That is separate from the plan-termination right. If you are unsure which applies, call your SHIP before you disenroll from anything.

Compare the Total Cost, Not the Premium

A plan's premium is the smallest part of the decision for many households. Build a simple annual comparison:

For 2026, the standard Part B premium is $202.90/month and the Part B deductible is $283. The first IRMAA threshold is $109,000 of MAGI for a single filer and $218,000 for married filing jointly. A large Roth conversion or capital gain can raise your premium two years later — which is why a coverage decision and a tax decision should be modeled together, not in separate silos.

What This Means for Your Retirement Spending

A plan change is a permanent change to your monthly budget, not just a one-time paperwork event. If your premium rises by $80/month and your drug costs rise by $40/month, that is $1,440 a year — roughly $36,000 of extra portfolio withdrawals over a 25-year retirement before investment returns.

That is why RetirePro models healthcare as a growing expense line rather than a footnote. Update the premium and out-of-pocket estimate in your plan, then see what the change does to your long-term success rate and your tax picture. If you are considering a Roth conversion, the planner shows how the extra income interacts with IRMAA thresholds.

Model your retirement budget with the new healthcare cost → · See the $9 Premium plan →

Your Before-December-7 Checklist

1. Confirm whether your plan is renewing. Check the ANOC, the plan's member portal, and the Medicare Plan Finder.
2. List your non-negotiables. Doctors, hospitals, specialists, and every prescription with dosage.
3. Compare at least two alternatives. One Advantage plan and one Original Medicare + Part D + Medigap path.
4. Check the network and formulary directly. Call the plan; do not rely on a sales presentation.
5. Confirm your Medigap rights and deadlines with your SHIP or a licensed agent before you disenroll.
6. Decide by December 7. Changes made during Open Enrollment take effect January 1, 2027.
7. If your plan is terminating, use the special enrollment period (generally December 8 – February 28) rather than assuming automatic placement.

The official Medicare Plan Finder is the right place to select a specific plan. For the broader decision tree — Part D, IRMAA, and coordinating coverage with a Roth conversion — see our Medicare Open Enrollment 2027 Decision Tree.

⚠️ Educational information only. This article is not insurance, tax, legal, or financial advice. Plan availability, premiums, networks, and formularies change annually; confirm details with Medicare.gov, the plan, or your SHIP before enrolling. RetirePro does not sell insurance and is not affiliated with any plan.