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Can You Go Back to Medigap After Medicare Advantage? The One-Way Turnstile

Writer: Sean Smith
Sean Smith
3 days ago
11 min read

Updated: 2 days ago

Short answer: Sometimes, but not always. Moving from Original Medicare into a Medicare Advantage plan takes one phone call. You can go back to Original Medicare during certain enrollment periods, but buying a Medigap policy again can mean answering questions about your health. Medicare.gov says that outside your Medigap Open Enrollment Period, "there's no federal guarantee that an insurance company will sell you a Medigap policy" unless you have a guaranteed issue right (Medicare.gov). A handful of situations protect you, and each one has a time limit. If you're thinking about switching during Open Enrollment (October 15 to December 7, 2026), learn these rules first.

This is general education, not personal Medicare, financial, or medical advice. We do not recommend any plan. For your own situation, talk with a licensed advisor or your free State Health Insurance Assistance Program (SHIP).

When can I change my Medicare coverage?

There are two windows, and people mix them up all the time. Mixing them up can cost you a whole year.

Window 1: Open Enrollment, October 15 to December 7, 2026. Whatever you choose starts January 1, 2027. In this window you can:

  • Join, drop, or switch a Medicare Advantage plan

  • Join, drop, or switch a drug plan

  • Move from Original Medicare into Medicare Advantage, or from Medicare Advantage back to Original Medicare

Your plan has to get your request by December 7. Mailing it isn't enough; it has to arrive. Don't wait for the last week. (Medicare.gov, "Joining a plan")

Window 2: Medicare Advantage Open Enrollment, January 1 to March 31. This is not a second Open Enrollment. It's only for people who are already in a Medicare Advantage plan. You can switch to a different Advantage plan, or drop your Advantage plan and go back to Original Medicare (and join a separate drug plan). You can't join Medicare Advantage for the first time in this window, and if you're in Original Medicare, you can't use it to change your drug plan. People who are new to Medicare and joined an Advantage plan also get a similar window during their first 3 months with Part A and Part B. (Medicare.gov, "Joining a plan")

What happens if I do nothing during Open Enrollment?

If your plan is still offered next year, you generally stay in it, under next year's terms. Its price, benefits, and drug list may all have changed.

That's what the letter from your plan is for. It's called the Annual Notice of Change. Plans send it (printed or electronic) by September 30, and it lists changes in coverage, costs, provider networks, service area, and more that take effect in January (Medicare & You 2027). It's the most useful piece of mail you'll get this year, and many people throw it away. Doing nothing is still a decision. You're just making it with your eyes closed.

What's the difference between Original Medicare, Medicare Advantage, and Medigap?

  • Original Medicare is the version run by the government. Part A covers the hospital and Part B covers doctors. You can use any doctor or hospital in the country that takes Medicare.

  • Medicare Advantage is a plan from a private insurance company that Medicare has approved. It's another way to get your Medicare coverage.

  • Medigap (Medicare Supplement Insurance) is an extra policy you can buy only if you have Original Medicare. It helps pay some of the costs Original Medicare doesn't, like copayments, coinsurance, and deductibles. It fills the gaps, which is why it's called Medigap. (Medicare.gov, "Get Medigap Basics")

Why is leaving Medicare Advantage harder than joining it?

Think of a turnstile at a ballpark. Going in, you push it and it spins easily. Try to walk back out the same way and it locks.

Going from Original Medicare into an Advantage plan is a phone call. Coming back can require answering questions about your health. When you return to Original Medicare, you'll probably want a Medigap policy again. Unless you're in a protected situation, the insurance company can use your health history (called medical underwriting) to turn you down, and outside your Medigap Open Enrollment Period you may pay more or have fewer choices (Choosing a Medigap Policy, 2026).

Here's how that can play out. Someone has had Original Medicare and a Medigap policy for years. They hear about a plan with extras and switch: one phone call. A couple of years later their health changes and they want their old setup back. They call about the Medigap policy, and now there can be health questions.

In Medicare's own words: "…there's no federal guarantee that an insurance company will sell you a Medigap policy" (Medicare.gov). The more health problems you have, the more that sentence matters.

The turnstile isn't a trick someone is playing on you. It's how the system was built. The problem is that nobody mentions it at the moment you choose.

When is Medigap guaranteed? The four "gates" from the episode

These are the four situations the episode focuses on. When one applies, the insurance company must sell you a policy, must cover your pre-existing conditions, and can't charge you more because of your health (Choosing a Medigap Policy, 2026, pp. 15–18).

  1. Your 6-month Medigap Open Enrollment Period. It starts the first month you have Part B and you're 65 or older. During those six months you can buy any Medigap policy sold in your state, and companies can't turn you down or charge you more for health problems. It's a one-time window and doesn't repeat. If you or someone you love is turning 65 soon, circle it. (Medicare.gov, "Get Medigap Basics")

  2. Trial right No. 1: you joined Medicare Advantage (or PACE) when you were first eligible for Medicare Part A at 65, and within the first year you decide to switch to Original Medicare. You can buy any Medigap policy sold in your state. (People new to Medicare on or after January 1, 2020 can't buy Plans C or F, but can buy D or G instead.) (Choosing a Medigap Policy, 2026, p. 18)

  3. Trial right No. 2: you dropped a Medigap policy to join Medicare Advantage for the first time, you've been in the plan less than a year, and you want to go back. You can get the same Medigap policy back if the same company still sells it. If it doesn't, you can buy Medigap Plan A, B, C, D, F, or G from a company in your state (C and F only if you were eligible for Medicare before 2020). (Choosing a Medigap Policy, 2026, p. 18)

  4. Your Advantage plan leaves Medicare, stops giving care in your area, or has a significant network change, or you move out of its service area. You can buy Medigap Plan A, B, C, D, F, or G sold in your state, but only if you switch to Original Medicare rather than joining another Advantage plan. (Choosing a Medigap Policy, 2026, p. 17)

Notice that gates 2 and 3 aren't the same thing. People say "you get 12 months to change your mind," but federally that's only true in those two trial-right situations.

Watch the clock (gates 2–4). For guaranteed issue rights like these, you can apply as early as 60 days before your Advantage coverage ends, and no more than 63 days after it ends. If your plan is ending, the deadline can also be the date in your plan's termination notice. Your 6-month window at 65 (gate 1) runs on its own timing. (Medicare.gov, "When can I buy a Medigap policy?"; Choosing a Medigap Policy, 2026, pp. 17–18)

Keep every letter, notice, email, or claim denial your plan sends you, plus the postmarked envelope. That's your proof. (Choosing a Medigap Policy, 2026, p. 19)

Federal law has a few other protected situations too. The official guide also lists these: employer, union, retiree, or COBRA coverage that pays after Medicare is ending; your Medigap company goes bankrupt or your policy ends through no fault of your own; you leave an Advantage plan or drop a Medigap policy because the company broke the rules or misled you; and you move out of a Medicare SELECT policy's service area. (Choosing a Medigap Policy, 2026, pp. 17–18)

Outside your Medigap Open Enrollment Period and these situations, there's no federal guarantee. Some states give you more protection than federal law does, so it's worth one call to your state insurance department or SHIP to ask. (Choosing a Medigap Policy, 2026, p. 16)

Is it illegal to sell Medigap to someone in a Medicare Advantage plan?

Generally, yes, with one important exception. If you're in a Medicare Advantage plan, it's illegal for anyone to sell you a Medigap policy unless you're switching back to Original Medicare (Medicare & You 2027). If you are leaving your Advantage plan, you can apply for Medigap before that coverage ends, and the company can sell it to you as long as your Advantage coverage ends before the Medigap policy starts. Ask for the Medigap policy to start the day your Advantage plan ends so you don't have a gap. (Choosing a Medigap Policy, 2026, pp. 9, 23)

If you're not planning to leave your Advantage plan and someone tries to sell you a Medigap policy, that tells you who you're dealing with. Report it to your state insurance department.

What Medicare late penalties never go away?

The second way people get hurt this season isn't by switching. It's by waiting.

  • Part B late penalty: an extra 10% for each full 12-month period you could have had Part B but didn't sign up (and didn't qualify for a Special Enrollment Period). It's not a one-time fee. It's added to your monthly premium, usually for as long as you have Part B. (Medicare.gov, "Avoid late enrollment penalties")

  • Part D (drug coverage) late penalty: if you go 63 days or more in a row without Medicare drug coverage or other creditable prescription drug coverage (coverage expected to pay, on average, at least as much as Medicare's standard drug coverage), you may owe a penalty when you join a drug plan later. It's added to your monthly drug premium, generally for as long as you have Medicare drug coverage, even if you switch plans. People who get Extra Help (the program that helps pay drug costs) generally don't pay it. (Medicare.gov, "Creditable prescription drug coverage"; Medicare.gov, "Avoid late enrollment penalties")

Does COBRA protect me from the Medicare Part B penalty?

No. Coverage based on a job you (or your spouse) are working at right now can let you put off Part B without a penalty. COBRA (the coverage you can keep paying for after you leave a job) doesn't count as current-employment coverage, and neither do retiree plans or VA coverage. Once your coverage based on current employment ends, you have 8 months to sign up for Part B without a penalty, whether or not you choose COBRA. Many people find this out too late. (Medicare & You 2027, pp. 18–19)

This matters for caregivers. A lot of caregivers leave a job or cut back to care for someone. If that's you and you're getting close to 65, find out your own Medicare dates, write them down, and don't let them slide because you were busy caring for someone else. You can sign up for Part A and Part B at SSA.gov/medicare/sign-up.

What should I do before December 7?

Take your own job, and read the other two anyway. Sooner or later, most of us hold all three.

If you're the person on Medicare:

  1. Find the Annual Notice of Change and open it. Look for three things: what you'll pay, what's covered, and whether your medicines are still on the list.

  2. Before you go through the turnstile, ask one question: "If I change my mind later, can I get a Medigap policy without health questions?" Ask before you switch, not after.

  3. Put December 7 on the calendar and on the fridge. Your plan has to get your request by then. And remember: if you do nothing, your current plan generally continues under next year's terms.

If you're family:

  1. Ask whether the plan's letter came, then sit down and read it together, at the table, not over the phone.

  2. Remember it's their decision. Your job is to make sure they know about the turnstile before they choose, not to choose for them.

  3. If someone is pushing a switch on the phone, at the door, or in the mail, slow it down. A good choice will still be a good choice tomorrow.

If you're a caregiver (paid or unpaid):

  1. You're the one who sees the mail pile up. You may be the only person who notices the letter never got opened. You're allowed to say, "This one looks important. Let's open it together."

  2. Find out your own Medicare dates.

  3. Write them down, and don't let them slide.

Which plan should I pick?

We won't tell you. Medicare Advantage is right for some people and wrong for others, and the same is true of Original Medicare with a Medigap policy. Anyone who says one is always better doesn't know your situation.

We also can't tell you what you'll pay next year. Medicare & You 2027 says the 2027 premium amounts, drug costs, and income limits weren't available when it was printed (Medicare & You 2027, p. 12).

Where can I get free Medicare help?

  • 1-800-MEDICARE (1-800-633-4227)

  • Your State Health Insurance Assistance Program (SHIP): free, personal counseling on exactly these questions. SHIPs aren't connected to any insurance company or plan. Find yours at shiphelp.org.

  • Your State Insurance Department: for any extra Medigap rights your state may add. Find yours at content.naic.org/state-insurance-departments.

  • Eldercare Locator: 1-800-677-1116, eldercare.acl.gov, for help finding services near you.

Frequently asked questions

Can I switch from Medicare Advantage back to Original Medicare?

Yes. You can switch back during Open Enrollment (October 15 to December 7) or, if you're already in an Advantage plan, during the January 1 to March 31 Medicare Advantage Open Enrollment Period (Medicare.gov). The harder part can be buying a Medigap policy again, because outside protected situations there's no federal guarantee an insurer will sell you one.

What is the Medigap "trial right"?

It's what Medicare calls two 12-month situations. (1) You joined Medicare Advantage when you were first eligible for Medicare Part A at 65 and switch to Original Medicare within the first year: you can buy any Medigap policy sold in your state. (2) You dropped a Medigap policy to try Advantage for the first time and leave within a year: you can get your old policy back if the same company still sells it, or else buy Plan A, B, C, D, F, or G. (Choosing a Medigap Policy, 2026, p. 18)

Do I have to answer health questions to get Medigap?

Not during your 6-month Medigap Open Enrollment Period or when you have a guaranteed issue right. Outside those, the company can use medical underwriting and may turn you down or charge more. Your state may offer more protection, so ask your state insurance department or SHIP.

What is the deadline for Medicare Open Enrollment in 2026?

December 7, 2026. Your plan must get your request by then, and new coverage starts January 1, 2027 (Medicare.gov).

What is the Annual Notice of Change?

It's the notice your plan sends by September 30 explaining what changes in January: costs, coverage, provider networks, service area, and more (Medicare & You 2027). If you do nothing and your plan continues, you stay in it under those new terms.

Does COBRA count as coverage for delaying Part B?

No. COBRA, retiree plans, and VA coverage don't count as coverage from current employment, so they don't protect you from the Part B late penalty (Medicare & You 2027).

Watch the full episode

Sean walks through the turnstile, reads Medicare's own sentence, explains the gates, and gives three steps each for the person on Medicare, the family, and the caregiver in "The One-Way Turnstile" on the Aging Whealthily Podcast.

Subscribe on YouTube. Everything we make is free: youtube.com/@AgingWhealthilyPodcast

Next Sunday, October 25: If your parent has dementia, Medicare may pay for you to get a break.

Sources

General education, not financial or medical advice. This article explains federal rules in general terms and does not recommend any plan, company, or agent. Your state may give you additional rights. For your own situation, talk with a licensed advisor or your free SHIP counselor.

About Sean and Bridget Smith

Sean and Bridget Smith host the Aging Whealthily Podcast, a weekly brain health and dementia caregiver support show for adults 50 to 75 and the families who care for them. They are co-founders of Power Couple Media, LLC in Middletown, Connecticut. They were trained by the Alzheimer's Association to teach its dementia care curriculum, and they teach it to working caregivers. Together they bring more than 50 years of combined healthcare experience, and for the last 10 years they've owned their own home care agency in Connecticut. Find more at AgingWhealthily.com. Because your brain and your money are not two separate conversations.

We don't age quietly. We age whealthily.

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