Yes, you can switch from Medicare Advantage to Medicare Supplement, but timing and your health status matter

You can move from a Medicare Advantage plan to a Medigap (Medicare Supplement) policy at certain times of year, and in some cases outside those windows if you meet specific conditions. The catch: once you leave Medicare Advantage, you cannot return to it that same year, and switching to Medigap may require you to answer health questions or pass medical underwriting — meaning the new plan can deny you or charge more based on your health history.

The easiest time to switch is during the Annual Enrollment Period (AEP), which runs October 15 to December 7 each year. Outside that window, you have limited options unless you experience a may have access to life event or fall into a protected category. Understanding which route applies to you now determines whether you can switch when ready or must wait.

Key Takeaways

  • You can switch to Medigap during the Annual Enrollment Period (October 15 to December 7) without health questions, as long as you are still enrolled in Medicare Part A and Part B.
  • If you switch outside AEP, most Medigap insurers will ask health questions and may deny coverage or charge higher premiums based on your medical history.
  • Certain life events — such as moving out of your plan's service area, losing employer coverage, or turning 65 — may open a special window to switch without health underwriting.
  • Once you leave Medicare Advantage, you cannot rejoin it until the following calendar year, so confirm your Medigap plan will cover the services you need before you switch.
  • Your current Medicare Advantage plan ends on December 31, and your new Medigap coverage begins January 1 if you enroll during AEP.

Switching During the Annual Enrollment Period

The Annual Enrollment Period is the simplest route. It runs from October 15 to December 7 each year, and during this window you can switch from Medicare Advantage to any Medigap plan offered in your state without answering health questions. This protection is called may provide issue — insurers must accept you regardless of your medical history.

To switch during AEP, contact the Medigap insurer directly or work with a broker who represents multiple insurers. You will need your Medicare number (on your red, white, and blue Medicare card) and confirmation that you are currently enrolled in Medicare Part A and Part B. Your new Medigap plan takes effect January 1 of the following year, and your Medicare Advantage plan automatically ends December 31.

Do not wait until December 6 or 7 to enroll. Insurers process applications throughout the period, and late submissions may not be processed in time for January 1 coverage. Most insurers recommend enrolling by early December to may support your paperwork clears before the year ends.

Switching Outside the Annual Enrollment Period

If you want to switch outside AEP, you enter what is called open enrollment for Medigap — which is not the same as Medicare's AEP. During open enrollment, Medigap insurers can ask you health questions, require a medical exam, or deny you coverage altogether. Some insurers will cover you but charge a higher premium based on your health status. This is called medical underwriting.

The specific health questions and underwriting rules vary by insurer and by state. Some states regulate how much insurers can charge based on health history; others do not. Before you contact an insurer, call your state's insurance commissioner's office or visit your state's health insurance information program (SHIP) to learn what protections explore where you live.

If you have a pre-existing condition or recent diagnosis, medical underwriting can be a barrier. Some insurers may decline you outright, while others may approve you at a much higher cost. This is why switching during AEP — when may provide issue applies — is strongly preferable if you can time it that way.

Special Circumstances That Allow Switching Without Health Questions

Even outside AEP, you may have a right to switch to Medigap without health underwriting if you fall into one of these categories:

  • You are moving out of your plan's service area. If your Medicare Advantage plan no longer serves your county or state, you have a window (usually 60 days from the date your plan notifies you) to switch to Medigap with may provide issue.
  • You are losing employer or union coverage. If you had a retiree health plan through a former employer or union and it ends, you may have 60 to 63 days to switch to Medigap without health questions.
  • You are within 12 months of turning 65. If you are newly may be able to access for Medicare and enroll in Medicare Advantage, you have a one-time right to switch to Medigap within the first 12 months without health underwriting.
  • Your plan was terminated. If your Medicare Advantage insurer exits the market and your plan is cancelled, you have a window to switch to Medigap may provide issue.
  • You enrolled in Medicare Advantage by mistake. If you were automatically enrolled in a plan you did not choose, you may have a limited window to switch without underwriting.

These windows are narrow and time-sensitive. If you believe you fall into one of these categories, contact your state's SHIP or your state insurance commissioner when ready to confirm the dates and your rights. Do not assume you may have access to — each situation is fact-specific.

What Happens to Your Coverage During the Switch

Your Medicare Advantage plan ends on December 31 (if you enroll during AEP) or on the date your new Medigap plan becomes effective (if you switch outside AEP). There is normally no gap in coverage as long as your new Medigap plan is in effect before your Medicare Advantage plan ends.

However, if you enroll in Medigap outside AEP and the insurer requires medical underwriting, approval can take several weeks. During that time, you remain covered by your Medicare Advantage plan. Do not cancel your Medicare Advantage plan until you have written confirmation that your Medigap plan is approved and active.

Once your Medigap plan is active, it covers the same Part A and Part B services as your Medicare Advantage plan did, but with different cost-sharing. Medigap plans are standardized by the federal government, so Plan G from one insurer covers the same things as Plan G from another — the difference is price and customer service. Review your new plan's coverage details before your old plan ends so you understand your new out-of-pocket costs.

Costs and Plan Comparison Before You Switch

Switching from Medicare Advantage to Medigap usually means higher monthly premiums but lower out-of-pocket costs when you use care. Medicare Advantage plans often have $0 premiums but charge copays and coinsurance; Medigap plans charge a monthly premium (typically $100 to $300 or more, depending on your age and location) but cover most or all of your Part A and Part B cost-sharing.

Before you switch, compare the total cost: your current Medicare Advantage premium plus what you typically spend on copays and deductibles, versus the Medigap premium plus your remaining out-of-pocket costs. If you use a lot of specialist care or have frequent hospital stays, Medigap may save you money. If you are healthy and rarely see a doctor, Medicare Advantage may still be cheaper overall.

Use the Medicare Plan Finder tool at Medicare.gov to see Medigap plans and prices in your area. Prices vary significantly by insurer and by location, so compare at least three plans before you decide. Some insurers offer discounts for paying annually instead of monthly, or for setting up automatic payments.

Common Mistakes to Avoid

Cancelling Medicare Advantage before Medigap is approved. If you enroll in Medigap outside AEP and medical underwriting is required, do not cancel your Medicare Advantage plan until you have written approval from the Medigap insurer. If the Medigap plan denies you, you will have no coverage.

Assuming you can return to Medicare Advantage. Once you leave Medicare Advantage, you cannot rejoin it until January 1 of the following year, and only during AEP. If you switch to Medigap in March and regret it in June, you are locked in until October.

Not checking your state's protections. Some states require Medigap insurers to offer may provide issue to people who switch outside AEP; others do not. Call your state insurance commissioner or SHIP before you contact an insurer, so you know what rights you have.

Forgetting to update your prescriptions. Medicare Advantage plans often have different pharmacy networks and formularies (lists of covered drugs) than Medigap plans. Before you switch, confirm that your current medications are covered under your new plan, or be prepared for higher out-of-pocket drug costs.

Frequently Asked Questions

Can I switch to Medigap if I have been diagnosed with a serious illness?

During AEP (October 15 to December 7), yes — may provide issue applies regardless of your health. Outside AEP, most Medigap insurers will ask health questions and may deny you or charge more. Your state may have protections that require may provide issue in certain situations; contact your state insurance commissioner to check.

What if my Medicare Advantage plan is being discontinued?

If your insurer is exiting the market or your specific plan is being cancelled, you have a may provide issue window to switch to Medigap. Your plan's cancellation notice will include the dates and instructions. Act within that window — the important date is firm.

Do I need to enroll in Part D (prescription drug coverage) when I switch to Medigap?

No. Medigap does not include prescription drug coverage. If you want drug coverage, you enroll in a standalone Part D plan. If you go without Part D coverage and later want to enroll, you may face a penalty. Discuss your drug coverage options with your Medigap insurer or your state's SHIP before you switch.

Can I switch Medigap plans after I enroll?

Yes, but only during AEP (October 15 to December 7) with may provide issue. Outside that window, the new Medigap insurer will ask health questions. Many people switch Medigap plans during AEP to find a lower premium, which is allowed.

What if I move to a different state after I enroll in Medigap?

Medigap plans are state-specific, so you will need to enroll in a new plan in your new state. Contact a Medigap insurer in your new state and ask about your rights during the move. Many states allow may provide issue for people relocating, but the rules vary.