Yes, you can switch from Medicare Advantage to Medigap, but the timing and your health matter

You can move from a Medicare Advantage plan to a Medigap policy (also called a Supplement plan) during certain windows in the year, and you do not need your insurance company's permission. The catch is that outside of those windows, insurers can deny you or charge more based on your health history. The best time to switch is during your plan's open enrollment period or within the first 12 months after you first signed up for Medicare Advantage — that is when you have the strongest protections.

Switching means leaving Medicare Advantage entirely and moving to Original Medicare paired with a Medigap policy. This is different from switching between Medicare Advantage plans. The process is straightforward if you time it right, but missing the protected windows can make it much harder or more expensive to get coverage.

Key Takeaways

  • You can switch to Medigap during your Medicare Advantage plan's annual open enrollment (October 15 to December 7 each year), with coverage starting January 1.
  • If you are within 12 months of first enrolling in Medicare Advantage, you have a may provide right to buy any Medigap policy without health questions or higher premiums.
  • Outside these windows, Medigap insurers can ask about your health and may refuse to sell you a policy or charge you more.
  • You will lose your Medicare Advantage coverage the day your Medigap policy starts, so coordinate the timing carefully to avoid gaps.
  • Your current prescription drug coverage will end when you switch, so you may need to enroll in a standalone Part D plan.

The two protected windows for switching without health questions

The strongest protection is the 12-month open enrollment period that starts the month you first enroll in Medicare Advantage. During this window, any Medigap insurer must sell you any policy you want at their standard rate — they cannot ask about your health or charge you more because of a pre-existing condition. This window closes 12 months after your Medicare Advantage coverage began, so if you enrolled in January, you have until the end of December of that same year.

The second protected window is annual open enrollment, which runs October 15 to December 7 each year. During this period, you can switch to a different Medicare Advantage plan, switch to Original Medicare with Medigap, or switch between Medigap policies. However, if you switch to Medigap during annual open enrollment and you are past your initial 12-month window, insurers can still ask health questions and may deny you or charge more. The protection is that you can switch — not that you will get the same price.

What happens to your coverage when you switch

Your Medicare Advantage plan ends the day your Medigap policy begins. You need to time this carefully so there is no gap in coverage. When you enroll in a Medigap policy during open enrollment (October 15 to December 7), coverage usually starts January 1 of the following year. Your Medicare Advantage plan will automatically end on December 31. If you are switching during your initial 12-month window outside of annual open enrollment, the timing depends on the Medigap insurer — some start coverage as soon as the next month, others may take longer.

Contact your Medigap insurer before you enroll to confirm the start date. Then call your Medicare Advantage plan to confirm the end date. Do not cancel your Medicare Advantage plan yourself — let it end automatically when your Medigap coverage begins. If you cancel early, you may lose coverage for a few days and face a penalty if you later need to re-enroll in Medicare. Keep both your Medicare Advantage and Medigap paperwork until you are certain the transition is complete.

Prescription drug coverage after you switch

Medicare Advantage plans include prescription drug coverage (Part D). When you switch to Medigap, that coverage ends. You will need to enroll in a standalone Part D prescription drug plan to keep paying lower rates on medications. You can enroll in Part D at the same time you enroll in Medigap, and it can start the same day your Medigap coverage begins.

If you do not enroll in Part D when you switch, you may face a late enrollment penalty if you sign up later. The penalty is a percentage of the national average Part D premium, added to your premium for as long as you have Part D coverage. Even if you do not take many medications now, enrolling in a plan keeps you protected against future costs and avoids the penalty. You can change which Part D plan you use during the next annual open enrollment, so choosing one now does not lock you in forever.

Health underwriting outside the protected windows

If you try to switch to Medigap outside of your initial 12-month window and outside of annual open enrollment, Medigap insurers can ask detailed health questions. They can refuse to sell you a policy, or they can sell you one but exclude coverage for conditions you already have. Some insurers may also charge you a higher premium based on your age and health.

This is why timing matters. If you know you want to switch, do it during one of the protected windows. If you miss both windows and have health conditions, you may find that few or no insurers will sell you a policy at all. In that case, you would stay on Medicare Advantage or switch back to Original Medicare without Medigap coverage — a choice that leaves you responsible for more out-of-pocket costs. Planning ahead prevents this situation.

How to enroll in a Medigap policy

Contact Medigap insurers directly — you can find them by searching your state's name plus "Medigap insurers" or by calling Medicare at 1-800-MEDICARE. Each insurer has its own enrollment process, usually by phone or online. You will need your Medicare card and information about your current coverage. Tell the insurer when you want your coverage to start and confirm that you are within a protected window (if you are, they cannot ask health questions).

Compare policies before you enroll. Medigap policies are standardized by the federal government — a Plan G from one insurer covers the same things as a Plan G from another — but premiums vary widely. You may save hundreds of dollars a year by comparing quotes from three to five insurers. Some states allow insurers to use your age and location to set premiums; others do not. Knowing your state's rules helps you understand why quotes differ. Your state insurance commissioner's office can tell you how premiums work in your state.

What to do if you miss the protected windows

If you are past your initial 12-month window and it is not annual open enrollment, you have limited options. You can still try to enroll in Medigap, but insurers can deny you or charge more. Some states have may provide issue rights that protect you in specific situations — for example, if your Medicare Advantage plan is leaving your area, or if you enrolled in Medicare Advantage by mistake. Check with your state's insurance commissioner's office to see if you may have access to.

Another option is to wait until the next annual open enrollment (October 15 to December 7) and switch then. You will still face health underwriting if you are past your initial 12 months, but at least you will have a defined opportunity to make the change. In the meantime, you can stay on your current Medicare Advantage plan or explore whether switching back to Original Medicare without Medigap makes sense for your situation. Some people find that staying on Medicare Advantage is the better choice if they cannot get Medigap coverage at a reasonable cost.

Frequently Asked Questions

Can I switch to Medigap if I have been on Medicare Advantage for more than a year?

Yes, but only during annual open enrollment (October 15 to December 7). Outside that window, Medigap insurers can ask about your health and may deny you or charge more. If you are within 12 months of first enrolling in Medicare Advantage, you can switch anytime without health questions.

What if my Medicare Advantage plan is being discontinued?

If your plan is leaving your area, Medicare sends you a notice. You have a special enrollment window to switch to another Medicare Advantage plan, Original Medicare, or Medigap without waiting for annual open enrollment. Contact Medicare or your plan to confirm your window and important date.

Do I need to tell my doctor I am switching plans?

Yes. Medigap does not include a network of doctors like Medicare Advantage does — you can see any doctor who accepts Medicare. Call your doctor's office to confirm they accept Medicare and Medigap. If your current doctor does not, you will need to find a new one before your switch takes effect.

Will I pay more for Medigap if I have diabetes or heart disease?

Only if you switch outside the protected windows. During your initial 12 months on Medicare Advantage or during annual open enrollment, insurers cannot charge you more or deny you based on health conditions. After that, they can — so switching during a protected window is important if you have ongoing health issues.

What happens to my Medicare Advantage copays and deductibles after I switch?

They end. Medigap covers the costs that Original Medicare does not — copays, coinsurance, and deductibles. Once your Medigap policy starts, you will use Original Medicare instead, and your Medigap policy will pay the gaps. Your out-of-pocket costs may be lower or higher depending on which Medigap plan you choose and how much medical care you use.