Yes, you can change your Medicare Supplement plan, but the rules depend on when you switch and what plan you're moving to

You are not locked into your current Medigap (Medicare Supplement) plan for life. You can switch to a different plan from your current insurer, move to a different insurance company, or drop your supplement coverage altogether. The catch is that timing matters. If you switch during certain windows, insurers must take you without medical underwriting — meaning they cannot deny you or charge more based on your health history. If you switch outside those windows, insurers can review your health and may refuse to cover you or charge higher premiums.

The most important window is your Medigap Open Enrollment Period, which lasts six months from the first day of the month you turn 65 and are enrolled in Medicare Part B. During this period, any insurer must sell you any Medigap plan they offer, regardless of your health. If you missed this window, you still have other routes — but they are narrower and depend on your specific situation.

Key Takeaways

  • Your six-month Medigap Open Enrollment Period starts the first day of the month you turn 65 and enroll in Medicare Part B; during this time, any insurer must sell you any plan without medical review.
  • If you miss Open Enrollment, you can still switch plans if you have a may have access to life event (such as moving out of your plan's service area, losing employer coverage, or your insurer leaving the market), and you must act within 60 days of that event.
  • Outside Open Enrollment and without a may have access to event, insurers can deny you coverage or charge more based on your health history.
  • You can switch plans at any time during the year, but the protection from medical underwriting only applies during Open Enrollment or after a may have access to event.
  • Your new plan's coverage begins on the first of the month following your request, so plan ahead if you want no gap in coverage.

Your Medigap Open Enrollment Period: The Protected Window

Your Open Enrollment Period is the easiest and safest time to switch. It runs for exactly six months, starting on the first day of the month in which you turn 65, as long as you are enrolled in Medicare Part B on that date. During these six months, you can switch to any Medigap plan offered by any insurer in your state, and the insurer cannot turn you down or charge you more because of any health condition you have.

If you turn 65 in March and enroll in Part B that same month, your Open Enrollment Period runs from March 1 through August 31. You can contact any Medigap insurer during this time and request a plan change. The new coverage typically starts on the first of the month after your request is processed — so if you request a switch on March 15, your new plan may begin April 1.

After your six-month Open Enrollment Period ends, this protection goes away. You can still switch plans, but insurers are no longer required to take you without reviewing your health.

Switching Plans After Open Enrollment: may have access to Events

If you miss your Open Enrollment Period, you may still switch plans without medical underwriting if you experience a may have access to event. The most common may have access to events are: you move out of your current plan's service area; your current insurer stops offering Medigap in your state or county; you lose other health coverage (such as retiree coverage from a former employer); or you are involuntarily disenrolled from your current plan.

When a may have access to event happens, you usually have 60 days from the date of the event to request a new plan. For example, if your insurer announces they are leaving your state on June 1, you have until July 31 to switch to another plan without medical review. You will need to document the event — keep the letter from your insurer, your moving documents, or proof of lost coverage.

Not all life changes count as may have access to events. Divorce, retirement, or straightforward wanting a better plan do not may have access to. If your situation does not fit a may have access to event category, you can still request a plan change, but the new insurer can review your health and may deny you or charge a higher premium.

How to Request a Plan Change

Contact your current insurer or the insurer whose plan you want to join. You can call the phone number on your insurance card, visit their website, or speak with a licensed insurance agent who sells Medigap plans in your state. Have your Medicare card and current Medigap policy number ready.

Tell the insurer which plan you want to switch to — plans are labeled A, B, C, D, F, G, K, L, M, or N, and each has a different set of covered services. If you are switching during Open Enrollment or within 60 days of a may have access to event, mention that so the insurer knows you are protected from medical underwriting. If you are switching outside these windows, the insurer will likely ask health questions or request a medical history before approving your request.

Once approved, your new coverage begins on the first of the month following your request. There may be a gap between when your old plan ends and your new plan starts, so request the change early enough to avoid being uninsured. Some insurers allow you to request a plan change effective on the first of the current month if you request it early enough in that month — ask about this option.

Switching Between Plans from the Same Insurer

If you want to stay with your current insurer but switch to a different plan they offer, the process is usually simpler and faster. Many insurers allow you to switch plans once per year without medical underwriting, even outside your Open Enrollment Period. Check your policy documents or call your insurer to ask about their plan-switching rules.

Switching within the same insurer is often the fastest route because you do not have to go through underwriting and the insurer already has your health information on file. Your new plan may begin as soon as the first of the next month, or sometimes even the first of the current month if you request early enough.

What Happens to Your Old Plan

Once your new plan begins, your old Medigap coverage ends automatically. You do not need to cancel it yourself — the new plan takes over. However, check with your old insurer to confirm the end date, especially if there is a gap between when you request the change and when the new plan starts. You do not want to pay premiums for two plans at once.

If you are dropping Medigap coverage altogether and relying only on Original Medicare, you can do that at any time. Your coverage will end on the date you request, or on the first of the following month if you request late in the month. Be aware that without a supplement plan, you will pay Medicare's deductibles, coinsurance, and copayments out of pocket.

Medical Underwriting: What Happens If You Switch Outside Protected Windows

If you switch plans outside your Open Enrollment Period and without a may have access to event, the new insurer can ask about your health history and may deny your request or charge you a higher premium than someone your age with no health conditions. This is called medical underwriting. The insurer may ask about past diagnoses, current medications, recent hospitalizations, or ongoing treatments.

Some insurers are more willing to take on older applicants with health conditions than others, so if one insurer denies you, another may accept you. Working with a licensed Medigap insurance agent can help — agents know which insurers in your state are more likely to approve applicants with specific health histories. You can find agents through your state's Department of Insurance or by searching online for "Medigap agents near me."

The best way to avoid medical underwriting is to switch during your Open Enrollment Period or within 60 days of a may have access to event. If you know you want to change plans, try to do it during one of these protected windows.

Frequently Asked Questions

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

You have a 30-day "free look" period from the date your new plan begins. During this time, you can cancel the new plan and return to your old one without penalty, as long as your old plan is still available. Contact your new insurer when ready if you want to cancel. After 30 days, you are locked into the new plan until the next opportunity to switch.

Can I switch to a cheaper plan if my health has gotten worse?

If you are outside your Open Enrollment Period and do not have a may have access to event, the new insurer can deny you or charge more because of your health. Your best option is to wait until your next Open Enrollment Period, which comes once per year if you are in a state that offers it, or to contact your state's Department of Insurance to ask about state-specific protections for people with serious health conditions.

What if my insurer stops offering Medigap in my state?

That is a may have access to event. You have 60 days from the date the insurer notifies you to switch to another plan without medical underwriting. The insurer must give you written notice of their departure, so keep that letter and use it as proof of your may have access to event when you request a new plan.

Do I have to switch plans, or can I keep the same one forever?

You can keep your current plan as long as the insurer continues to offer it in your state and you pay your premiums on time. There is no requirement to switch. However, premiums typically increase each year, so it is worth reviewing your plan annually to see if switching would save you money.

How do I know which plan is right for me?

Plans A through N cover different combinations of Medicare's deductibles, coinsurance, and copayments. Plan G, for example, covers most of Medicare's costs except the Part B deductible. Plan N covers less but has lower premiums. Compare what each plan covers, what the monthly premium is, and whether your doctors accept that plan's network. Your state's Health Insurance Counseling and information Program (HICAP) offers free, unbiased guidance on plan choice.