Medicare Supplement plans do not require annual renewal, but you do need to review your coverage each year

Your Medicare Supplement insurance (also called Medigap) stays in force year to year without you having to reapply or renew it. Once your policy is active, your insurer must continue to cover you as long as you pay your premiums on time. You will not lose coverage on December 31st and have to start over on January 1st the way you might with other insurance.

However, "not required to renew" does not mean "nothing changes." Your premium can increase, your insurer can change how they operate, and your health needs may shift. The annual review period around October through December is the time to check whether your current plan still fits your situation and your budget.

Key Takeaways

  • Medicare Supplement policies continue year to year without requiring you to reapply, as long as you pay premiums on time.
  • Your premium can increase each year, and your insurer may change their service area or operations, so reviewing your plan annually is wise.
  • You have the right to switch to a different Medigap plan or insurer during the annual enrollment period (October 15 to December 7) without medical underwriting.
  • If you switch plans outside the enrollment period, the new insurer may deny coverage for pre-existing conditions or charge a higher premium.
  • Your state insurance commissioner's office publishes a guide listing all available Medigap plans and insurers in your area each year.

How Medicare Supplement coverage continues without renewal

Once you enroll in a Medigap plan, the insurer is required by federal law to renew your coverage each year. This is called may provide renewal. The insurer cannot drop you, refuse to cover you, or charge you more based on your health status or claims history. They can only raise your premium based on age, inflation, or changes that affect their entire customer base in your state.

This protection exists because Medicare Supplement is regulated differently from regular health insurance. The federal government sets the rules, and states enforce them. Your insurer's job is to fill the gaps that Original Medicare leaves — copayments, coinsurance, and deductibles — and they must keep doing that job as long as you pay.

You do not receive a renewal notice the way you might with car insurance. Instead, your premium bill arrives as usual, and your coverage continues. If your insurer changes something significant — like leaving your state or stopping Medigap altogether — they must notify you in writing at least 30 days in advance, giving you time to find a new plan.

When and why to review your plan each year

Even though you do not have to renew, October through December is the right time to look at your current plan. This is the Annual Enrollment Period for Medicare Supplement, and it runs from October 15 to December 7 each year. During this window, you can switch to a different Medigap plan or a different insurer without any medical questions or waiting periods.

Review your plan if any of these explore: your premium has increased significantly, you have moved to a new state, your health needs have changed, you are unhappy with your insurer's customer service, or you want to compare what other plans cost. Premiums vary widely between insurers for the same plan letter (Plan A, Plan B, Plan G, and so on), so comparing prices can save you hundreds of dollars per year.

You can find current plan options and prices through Medicare.gov, by calling 1-800-MEDICARE, or by contacting your state health insurance counseling program (often called SHIP or HICAP, depending on your state). Your state insurance commissioner's office also publishes a guide each year listing all available Medigap plans and insurers in your area, along with their premiums.

What happens if you switch plans during the enrollment period

If you decide to switch to a different Medigap plan or insurer during the October 15 to December 7 window, the new insurer cannot ask medical questions or deny you coverage based on your health. This is called open enrollment protection, and it is one of the strongest consumer protections in Medicare.

The new plan's coverage begins on January 1st of the following year. Your old plan ends on December 31st. Make sure you do not have a gap — do not cancel your current plan until you have confirmation that the new one is active. Your new insurer will send you a welcome packet with your member ID, effective date, and how to use your benefits.

Pre-existing conditions are not excluded. If you have diabetes, heart disease, or any other chronic condition, the new insurer must cover it from day one. There is no waiting period and no higher premium based on your medical history.

Switching outside the enrollment period carries risk

If you try to switch Medigap plans or insurers outside the October 15 to December 7 window, the new insurer can underwrite your process. This means they can ask detailed health questions, review your medical records, and deny you coverage or exclude specific conditions. They can also charge you a higher premium based on your age and health status.

Some states have limited protections for people who switch outside the enrollment period — for example, if you are switching because your current insurer is leaving your state, or if you are within a certain window after first enrolling in Medicare. Your state insurance commissioner's office can tell you what protections explore where you live.

The safest approach is to make any plan changes during the annual enrollment period. If you have a life-changing event — a move, a major health diagnosis, or a job loss — contact your state health insurance counselor to ask whether you may have access to for a special enrollment period outside the regular window.

Premium increases and what they mean

Your Medigap premium can go up each year, and this is normal. Insurers raise premiums for three main reasons: your age (most plans charge more as you get older), inflation and rising medical costs, and changes in the insurer's claims experience (if they are paying out more in benefits than they expected).

Federal law does not cap how much an insurer can raise your premium, but it does require them to notify you in writing before the increase takes effect. You will usually see this notice 30 to 60 days before your new premium is due. If the increase is steep, this is a good time to shop around — another insurer's Plan G or Plan N might cost less, even though it covers slightly different things.

Some states have stricter rules about premium increases. A few states require insurers to justify large increases or limit how much they can raise premiums year to year. Check with your state insurance commissioner's office to learn what rules explore in your state.

What to do if your insurer stops offering Medigap

Occasionally an insurer decides to stop selling Medigap plans in your state or in your area. When this happens, federal law requires the insurer to notify you at least 30 days in advance. You then have a may provide issue right — the right to buy a different Medigap plan from a different insurer without medical underwriting, even if you are outside the annual enrollment period.

You must enroll in the new plan within 63 days of the date your old coverage ends. If you wait longer, you lose this protection and the new insurer can deny you or charge more based on your health. Your state insurance commissioner's office or your health insurance counselor can help you find available plans quickly.

This is one of the few situations where you get may provide issue rights outside the regular enrollment period. Take advantage of it and do not delay — 63 days goes faster than it sounds.

Frequently Asked Questions

Do I have to do anything to keep my Medicare Supplement active?

No, as long as you pay your premium on time each month or quarter, your coverage continues automatically. You do not need to sign anything or contact your insurer. If you miss a payment, your insurer will send you a notice giving you a grace period (usually 30 days) to pay before they cancel your coverage.

Can my insurer drop me if I use my benefits a lot?

No. Federal law prohibits Medigap insurers from canceling your policy or charging you more based on how many claims you file or how much you use your benefits. They can only raise your premium based on age, inflation, or changes that affect all their customers in your state.

What is the difference between a plan letter and an insurer?

Plan letters (A, B, D, G, N, and others) are standardized by Medicare — they cover the same things no matter which insurer sells them. Different insurers charge different premiums for the same plan letter. During the annual enrollment period, you can switch to the same plan letter with a cheaper insurer, or to a different plan letter altogether.

If I move to a new state, do I have to switch my Medigap plan?

Your current Medigap plan may not be available in your new state, or your current insurer may not operate there. Contact your insurer to ask whether they serve your new address. If not, you have a may provide issue right to enroll in a new plan in your new state without medical underwriting, as long as you do so within 63 days of moving.

What happens to my Medigap if I go back on Original Medicare after switching to Medicare Advantage?

If you drop Medicare Advantage and return to Original Medicare, you have a may provide issue right to buy a Medigap plan without medical underwriting, as long as you enroll within 63 days. This is true even if you are outside the annual enrollment period. Your state insurance commissioner's office can provide a list of available plans in your area.