You can change your Medigap plan during specific windows each year, and the rules depend on whether you're switching plans or insurers

Medicare supplement plans (also called Medigap) lock you in for a year at a time, but you're not stuck forever. You have may provide windows to switch to a different plan or a different insurance company — the main ones are your birthday month, the annual open enrollment period in the fall, and the first 60 days after you turn 65. Outside these windows, an insurer can deny you or charge more based on your health. Knowing which window applies to you now saves you from getting stuck with a plan that no longer fits your needs or budget.

Key Takeaways

  • Your birthday month gives you the right to switch to any Medigap plan from any insurer without health questions, as long as you've had Medigap for at least 12 months.
  • The annual open enrollment period runs from October 15 to December 7 each year, and you can switch plans or insurers during this time.
  • The first 60 days after you turn 65 are a one-time window to switch plans without health underwriting, even if you've never had Medigap before.
  • Outside these windows, insurers can ask health questions and may deny you or charge higher premiums based on your medical history.
  • You must contact your new insurer to switch; Medicare does not handle Medigap plan changes.

Your birthday month: the easiest time to switch

If you've had a Medigap plan for at least 12 months, your birthday month is your may provide window to switch to any other Medigap plan from any insurer. You don't have to answer health questions, and the insurer cannot charge you more or deny you based on your medical history. This window lasts the entire calendar month in which you were born — not just the day itself.

This is the most straightforward route if you've been on Medigap for over a year. You can switch to a cheaper plan, a plan with better coverage, or a different company. The new coverage typically starts on the first day of the month after your birthday month, though some insurers may offer earlier start dates. Contact the new insurer directly to start the switch — they will handle the paperwork and coordinate with your current plan.

The annual open enrollment period in the fall

Every year from October 15 to December 7, you can switch Medigap plans or insurers without health questions. This window is open to anyone with a current Medigap plan, regardless of how long you've had it. Like your birthday month, insurers cannot deny you or charge more based on health during this period.

This is the time many people use to compare plans and prices across different companies. Premiums often change from year to year, and a plan that was affordable last year may cost more now. The open enrollment period gives you a chance to shop around without penalty. Coverage from a plan you switch to during this period usually starts January 1 of the following year.

The first 60 days after you turn 65

When you first become may be able to access for Medicare at 65, you have a one-time 60-day window to switch Medigap plans without health underwriting. This applies whether you're buying your first Medigap plan or switching from one plan to another. During these 60 days, no insurer can deny you or charge you more based on your health status or medical history.

This window is crucial for people who buy a Medigap plan and then realize it doesn't meet their needs. If you sign up for Plan G but later decide you want Plan N, you can switch within the 60 days without consequences. Once the 60 days end, you lose this protection and will face health questions if you try to switch outside your birthday month or the annual open enrollment period.

What happens if you try to switch outside these windows

Outside the may provide windows, insurers can ask detailed health questions and use your answers to decide whether to accept you. They may deny your request to switch, charge you a higher premium than someone your age with no health conditions, or exclude coverage for certain conditions you already have. Some insurers may refuse to cover pre-existing conditions for up to six months.

The longer you wait after one of your may provide windows closes, the riskier it becomes to switch. A plan that costs $20 more per month during your birthday month might cost $50 more if you explore outside any protected window. For this reason, it's worth reviewing your plan options during your birthday month or the fall open enrollment period, even if you're not planning to switch right away.

How to switch your Medigap plan

Contact the insurance company offering the plan you want and tell them you want to switch. Have your Medicare card and your current Medigap policy number handy. The new insurer will ask which plan you want, when you want coverage to start, and whether you're switching during a may provide window (birthday month, open enrollment, or within 60 days of turning 65).

You do not need to cancel your current plan first — the new insurer will coordinate the switch. Your old coverage will end on the last day of the month before your new coverage starts. Make sure there are no gaps: confirm the start date with the new insurer before your old plan ends. If you're switching during your birthday month or open enrollment, the new insurer cannot ask health questions. If you're switching outside these windows, be prepared to answer questions about your medical history.

Special situations: when you can switch outside the regular windows

A few situations give you the right to switch even outside your birthday month or open enrollment. If your Medigap insurer stops selling plans in your state or county, you have a window to switch to another plan. If you move to a different state, you may have a limited time to switch to a plan available in your new state. If you lose Medicaid coverage, you get a window to switch plans.

These situations are less common, but they matter if they explore to you. If your insurer notifies you that they're leaving your area, read the notice carefully — it will tell you how long you have to switch. If you move, contact your current insurer to ask whether you can keep your plan in your new state or whether you need to switch. If you lose Medicaid, contact your Medigap insurer to ask about your options.

Frequently Asked Questions

Can I switch plans if I'm in the middle of treatment for a serious illness?

Yes, if you're within a may provide window (birthday month, open enrollment, or first 60 days after turning 65), you can switch without health questions. Outside these windows, the new insurer can ask about your illness and may deny you or charge more. If you're in active treatment, try to switch during your next birthday month or the fall open enrollment period.

What if I switch plans and then realize I made a mistake?

If you switch during your birthday month or open enrollment, you have a limited time to switch again — usually 30 days. If you switch outside a may provide window, you're locked in for the rest of the year and cannot switch again until your next birthday month or open enrollment. Always review the plan details before you switch.

Do I lose coverage if I switch in the middle of the month?

No. Your new Medigap plan typically starts on the first day of a month, and your old plan covers you until the last day of the previous month. There should be no gap in coverage. Confirm the exact start date with your new insurer before your old plan ends.

Can I switch from one insurer to another if they offer the same plan?

Yes, during your birthday month or open enrollment, you can switch to the same plan from a different company. This is useful if another insurer offers the same coverage for a lower price. Outside these windows, the new insurer can ask health questions.

What if my birthday is in December — do I get my window in December or January?

Your birthday month is the calendar month in which you were born. If you were born in December, your window is December 1 to December 31. You do not get a second window in January.