Can You Switch Medigap Plans in 2027? Guaranteed-Issue Rights and Deadlines
Medicare Open Enrollment started October 15, 2026, but it does not give everyone a fresh right to buy or switch Medicare Supplement Insurance (Medigap) for 2027. You can leave a Medicare Advantage plan during the annual enrollment period and still discover that a Medigap insurer may reject your application based on your health. The protection depends on why you are changing coverage, when your Medicare benefits began, and the law in your state.
Before dropping an existing policy or selecting Original Medicare for January, establish whether you have a Medigap guaranteed-issue right. That is a legal protection requiring insurers to sell qualifying policies without using medical underwriting to deny your application. Being allowed to change Medicare coverage and being guaranteed a Medigap policy are separate questions.
Which Medigap switching situation describes you?
| Your situation | What federal rules generally provide | What to check next |
|---|---|---|
| You’re at least 65 and newly enrolled in Part B | One-time, six-month Medigap Open Enrollment Period with protection against health-based denial | The month Part B started and which policies are offered in your state |
| Your Medicare Advantage plan is ending or leaving your service area | A qualifying involuntary loss can provide a guaranteed-issue right when you return to Original Medicare | The precise reason in the termination notice, eligible Medigap plans, and application dates |
| You joined Medicare Advantage for the first time and are within an eligible trial period | A qualifying return to Original Medicare within the first year can carry special Medigap rights | Whether you meet one of the federal trial-right definitions |
| You already have Medigap and want a cheaper insurer | No general federal right to switch without underwriting after your initial window ends | State protections, the new insurer’s acceptance, and its actual premium |
| You’re voluntarily leaving a continuing Medicare Advantage plan | Annual Medicare enrollment alone does not guarantee Medigap acceptance | Trial rights, another qualifying event, or state-specific protections |
| You’re moving or have Medicare before age 65 | Rights depend on the type of coverage, the reason for the move, and sometimes state law | Medicare’s case-specific eligibility tool and your state insurance department |
The table is a screening tool, not an eligibility determination. For example, a move out of a Medicare Advantage service area can create protections that an ordinary move by someone keeping Original Medicare may not. Medicare provides an interactive policy-switching guide that asks about the specific circumstances.
Why the October 15–December 7 deadline can mislead you
Medicare’s annual Open Enrollment runs October 15 through December 7, 2026, for Medicare Advantage and Part D changes effective January 1, 2027. It permits a move from Medicare Advantage back to Original Medicare, but that election does not automatically trigger a new six-month Medigap enrollment period. The separate Medigap Open Enrollment Period generally begins the first month you are both at least 65 and enrolled in Part B, and lasts six months.
Consider someone who enrolled in Part B at 65, chose Medicare Advantage, and is now 72. If the Advantage plan continues operating and the person simply prefers Original Medicare in 2027, the annual election period makes that change possible, but federal law generally does not require a Medigap insurer to accept them. A specific trial right or stronger state law could change the result; the person should verify that before giving up current coverage.
People already in Medicare Advantage also have a January 1–March 31 Medicare Advantage Open Enrollment Period when they can make one permitted change, including returning to Original Medicare. It is another chance to change Medicare coverage, not a universal second chance to buy Medigap without underwriting. Someone who needs a supplement should check its availability before relying on that later period.
When a plan closes: protect the guaranteed-issue window
Suppose a Medicare Advantage plan sends a notice saying it will not renew after December 31, 2026. A qualifying plan nonrenewal can give its members the right to buy certain Medigap policies if they return to Original Medicare, even long after their initial enrollment period. Medicare generally allows applications beginning 60 days before the Advantage coverage ends and continuing no more than 63 days afterward; the available policy types and any exceptions depend on the specific right.
Do not wait until February to start comparing policies just because the federal application window may extend into 2027. Ask the insurer whether coverage can start January 1, confirm the application and proof requirements, and make sure you know how drug coverage will continue. Our guide to Medicare plans ending or changing for 2027 covers the separate task of choosing replacement Medicare Advantage or Part D coverage.
Keep the actual nonrenewal or service-area notice, any insurer correspondence and proof of the date coverage ends. Medicare says insurers can request documentation establishing your guaranteed-issue circumstances. The words in the notice matter: a plan ending its contract, a plan withdrawing from your area and a continuing plan merely changing copays may lead to different rights.
Two first-year trial rights worth checking
One federal trial right applies when you joined a Medicare Advantage plan when first eligible for Medicare Part A at 65 and decide within the first year that you want Original Medicare instead. Another applies when you dropped an existing Medigap policy to try Medicare Advantage for the first time and want to return within the eligible 12-month period. In the second situation, you may have a right to regain your old Medigap policy if the insurer still sells it; otherwise, a specified selection of policies may be available.
These are distinct eligibility tests, and the right does not restart each time you try another Advantage plan. Medicare describes both in its Medigap coverage and trial-right guidance. If you think you qualify, ask 1-800-MEDICARE or your State Health Insurance Assistance Program (SHIP) to confirm the deadline and exactly which policies you can purchase.
Already have Medigap? Calculate the savings before applying
Imagine you hold a standardized Medigap Plan G with a $248 monthly premium, and another company quotes $193 for the same lettered coverage in your state. The premium difference is $55 a month, or $660 over twelve months. That is a worthwhile quote to investigate, because standardized plans with the same letter generally provide the same core benefits, although premiums, future rate increases and administrative experience can differ.
But that $660 figure is a potential saving only if the second insurer will actually issue the new policy at the quoted price. Outside a protected period, an insurer in many states can use medical underwriting or decline the application. Get written acceptance and a confirmed effective date before canceling the existing policy; Medicare also describes a 30-day free-look period when switching, during which you may need to pay both premiums.
A move by itself does not necessarily require replacing Medigap: you can generally keep a Medigap policy when you move if you retain Original Medicare. There are additional rules for Medicare SELECT policies and for people whose Medicare Advantage coverage no longer serves their new location. Massachusetts, Minnesota and Wisconsin also standardize Medigap policies differently from the usual national plan-letter system, so a comparison based on Plan G prices should not be copied mechanically into those markets.
Your state may offer more protection than federal law
Federal guaranteed-issue rules are a minimum, not the entire picture. For example, the New York Department of Financial Services states that insurers writing Medigap coverage in New York must accept eligible Medicare applicants throughout the year without using health status to deny them or vary premiums. Someone who faces underwriting elsewhere could therefore have a materially different set of options under New York law.
Other states have their own switching periods, eligibility conditions or protections, and the rules can differ for people who qualified for Medicare before age 65. Find your regulator through the National Association of Insurance Commissioners directory and ask whether a law covering your particular age, existing policy and proposed replacement applies in 2027. An insurer’s marketing description of a switching opportunity is not a substitute for verifying the applicable right and its dates.
Before you change 2027 coverage
- Identify your starting coverage. Write down whether you have Original Medicare plus Medigap, or Medicare Advantage, and when Part B and the current plan began.
- Name the event. Is your plan ending, are you in a first-year trial right, or do you simply want a lower premium? Obtain the relevant notice if there is one.
- Confirm federal and state Medigap rights. Use Medicare’s eligibility tool and your state insurance department. Ask which policy types are protected, not only whether some supplement is available.
- Apply while the right is active. Keep proof of the application, insurer acceptance and the intended effective date. Do not cancel a current Medigap policy on the strength of an unapproved quote.
- Coordinate drug coverage. Modern Medigap policies generally do not include Part D, so check a separate prescription plan when returning to Original Medicare. Our 2027 Part D comparison explains how to evaluate premiums, formularies and the drug-spending threshold.
- Compare the entire replacement arrangement. Include the Part B premium, Medigap premium, Part D premium and expected medical costs. Review our Original Medicare versus Medicare Advantage guide if you are changing the way you receive Medicare benefits.
If you are leaving Medicare Advantage, confirm the disenrollment timing and supplement eligibility before assuming everything will begin automatically on January 1. Free, unbiased assistance is available through SHIP or 1-800-MEDICARE (1-800-633-4227). Ask for the specific guaranteed-issue provision that applies to your circumstances and document what you are told; it is easier to resolve an eligibility question before your existing coverage ends.