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

You can move from a Medicare Advantage plan to a Medigap policy at certain times during the year, and in some cases you have may provide acceptance regardless of your health. The catch: if you miss the main window, insurers can deny you or charge more based on pre-existing conditions. The window that gives you the strongest protection is your first 12 months after enrolling in Medicare Part B — during this time, Medigap insurers must accept you without medical underwriting and cannot charge more for health problems.

Outside that window, you can still switch during the annual Medicare open enrollment period (October 15 to December 7), but insurers are allowed to review your health history and may refuse coverage or set higher premiums. A few states have additional protections, and certain life events — like losing employer coverage or moving out of your plan's service area — can open a special window. The process itself is straightforward: you pick a Medigap plan, submit an process to the insurance company, and your Advantage plan ends on the date your Medigap coverage begins.

Key Takeaways

  • Your first 12 months after enrolling in Medicare Part B is the only time insurers must accept you for Medigap without checking your health history or charging more for pre-existing conditions.
  • During the annual open enrollment period (October 15 to December 7), you can switch to Medigap, but insurers can deny you or charge higher premiums based on your medical record.
  • Some states have additional protections that extend may provide acceptance beyond the first 12 months; check your state's insurance department website to see if yours is one of them.
  • You do not need permission from Medicare or your Advantage plan to switch — you explore directly to the Medigap insurance company, and coverage begins on the date you choose.
  • Switching during open enrollment means your Advantage plan ends on December 31 and your Medigap coverage begins January 1, so you have no gap in coverage.

The 12-Month Window: Your Best Protection

When you first enroll in Medicare Part B, federal law gives you a may provide issue period that lasts 12 months. During this time, any Medigap insurer must sell you any plan they offer in your state, at standard rates, without asking about your health or medical history. This is the strongest protection you have, and it applies whether you enroll in Medicare Advantage first or go straight to Original Medicare and Medigap.

The 12 months start on the first day of the month you turn 65 and enroll in Part B, or the first day of the month you become may be able to access for Medicare due to disability or end-stage renal disease. If you enrolled in Medicare Advantage during this window and now want to switch to Medigap, you are still within the may provide issue period as long as you have not yet reached the 12-month mark from your Part B enrollment date. You do not have to prove anything or wait for open enrollment — you can switch at any time during those 12 months.

Switching During Open Enrollment (October 15 to December 7)

If you miss the 12-month window, you can still switch during the annual Medicare open enrollment period, which runs from October 15 to December 7 each year. During this window, you can move from Medicare Advantage to Medigap, from one Advantage plan to another, or from Original Medicare to Advantage. However, outside the 12-month may provide issue period, Medigap insurers are allowed to underwrite your process — meaning they can review your medical history, deny you coverage, or charge a higher premium.

When you switch during open enrollment, your Medicare Advantage plan automatically ends on December 31, and your new Medigap coverage begins on January 1. You do not have a gap in coverage, and you do not need to notify your Advantage plan or Medicare directly. The Medigap insurer handles the coordination. If an insurer denies your process during open enrollment, you can try another insurer or plan type — there is no rule that says all insurers must reject you, only that they are permitted to.

State-Specific Protections and Special Circumstances

A handful of states have passed laws that extend may provide issue protections beyond the federal 12-month window. Connecticut, Florida, Georgia, Indiana, Louisiana, Maine, Mississippi, Missouri, Montana, Nevada, New Hampshire, New Mexico, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas, Virginia, and West Virginia all have some form of extended protection. The rules vary by state — some may provide acceptance for anyone switching from Advantage to Medigap during open enrollment, while others limit it to certain ages or circumstances. Contact your state's insurance department or visit its website to learn what applies to you.

You may also have access to a special enrollment window if you lose your Advantage plan involuntarily — for example, if your plan is discontinued, you move out of the service area, or you lose coverage due to incarceration. In these cases, you typically have 60 days from the date you lose coverage to switch to Medigap with may provide issue protections. Similarly, if you were covered by an employer group health plan and that coverage ends, you may have a special window. Contact Medicare at 1-800-MEDICARE to confirm whether your situation qualifies.

What Happens to Your Advantage Plan When You Switch

You do not need to formally cancel your Medicare Advantage plan. When your Medigap coverage becomes effective, your Advantage enrollment automatically ends. If you are switching during open enrollment, your Advantage plan ends on December 31 and your Medigap begins January 1. If you are switching outside open enrollment (which is only possible within the 12-month window or under a special circumstance), you can choose the effective date of your Medigap coverage, and your Advantage plan will end on the day before.

Do not contact your Advantage plan to cancel — doing so can sometimes cause confusion or delays. Instead, let the Medigap insurer manage the transition. When you submit your Medigap process, you will be asked for your current Medicare information, and the insurer will coordinate the change with Medicare. Once your Medigap coverage is active, you will receive a new card and your Advantage card will no longer be valid.

Costs and Plan Selection When Switching

Medigap premiums vary by insurer, age, location, and plan type. Unlike Medicare Advantage, which has a single monthly premium, Medigap plans are standardized by the federal government — a Plan G from one insurer covers the same benefits as Plan G from another, but the price can differ significantly. When you switch, you choose which plan letter (A, B, D, G, K, L, M, or N) you want and which insurer to buy from. Insurers use different pricing models: some charge based on your age when you enroll (issue-age pricing), others charge based on your current age (attained-age pricing), and some use a combination.

If you switch within the 12-month may provide issue period, insurers cannot charge you more because of your health, but they can still charge based on age and location. If you switch during open enrollment or under a special circumstance outside the 12-month window and an insurer accepts you, they may explore a higher premium if you have pre-existing conditions. Request quotes from multiple insurers before you decide — the same plan can cost $50 to $100 more per month depending on the company.

Common Mistakes to Avoid

The biggest mistake is waiting too long to switch. If you enroll in Medicare Advantage and later decide Medigap is a better fit, do not assume you can switch whenever you want. Mark your calendar for the end of your 12-month may provide issue period and the start of open enrollment. If you miss both, you may face medical underwriting and higher costs or denial.

Another common error is not checking whether your state has extended protections. If you live in one of the states listed above, you may have more flexibility than the federal rules allow. A third mistake is switching without comparing plans and insurers. Medigap plans are standardized, but prices are not — spending 30 minutes getting quotes can save you hundreds of dollars per year. Finally, do not cancel your Advantage plan yourself or contact Medicare to cancel it. Let the Medigap insurer handle the transition; they know how to coordinate it correctly.

Frequently Asked Questions

What if I switch to Medigap and then want to go back to Medicare Advantage?

You can switch back to Advantage during the annual open enrollment period (October 15 to December 7). However, unlike switching from Advantage to Medigap, there is no may provide issue period for switching back to Advantage. Some Advantage plans may deny you or charge more based on health conditions. If you think you might want Advantage again, switching to Medigap is a one-way door unless you are willing to risk underwriting.

Do I have to switch to Medigap during open enrollment, or can I do it any time?

You can switch any time during your first 12 months after enrolling in Medicare Part B, regardless of the calendar. Outside that window, you can only switch during open enrollment (October 15 to December 7) or if you may have access to for a special circumstance. If you miss both, you will have to wait until the next open enrollment period.

Will my Medigap plan cover the same doctors and hospitals as my Advantage plan?

Medigap does not have a network. You can see any doctor or hospital that accepts Medicare and Original Medicare, which is nearly all of them. This is different from Advantage, which usually limits you to in-network providers. If you are switching because your Advantage plan's network is too narrow, Medigap will give you much more freedom to choose providers.

What if a Medigap insurer denies my process during open enrollment?

If one insurer denies you, try another. There is no rule that all insurers must reject you. You can also contact your state's insurance department to file a complaint or ask for help. Some states have consumer information programs that can advocate on your behalf if you are being unfairly denied.

Do I need to tell Medicare or my Advantage plan that I am switching?

No. You explore directly to the Medigap insurance company, and they coordinate the change with Medicare. You do not need to contact your Advantage plan or Medicare yourself. The Medigap insurer will handle all the paperwork and timing.