You can change Medicare Supplement plans during specific windows, and missing them usually means waiting until the next one opens

Medicare Supplement plans (also called Medigap) lock you into a contract with an insurance company, but you are not locked in forever. You can switch to a different plan or a different company, but only during certain times of year. The main window is your annual open enrollment period, which runs from October 15 to December 7 each year — and any plan change takes effect January 1. Outside that window, you can switch only if you meet specific conditions, and some of those conditions have strict time limits. Missing a important date often means you cannot switch until October comes around again.

The rules exist to protect both you and insurance companies. They prevent people from waiting until they get sick to buy coverage, but they also may provide that you have at least one predictable window every year when you can switch without barriers. Understanding which window applies to your situation is the difference between switching when you want to and being stuck for a year.

Key Takeaways

  • The annual open enrollment period runs October 15 to December 7, and any switch you make takes effect January 1 of the following year.
  • You can switch outside the annual window if you lose your current coverage, move to a new state, or turn 65 and are in your first year of Medicare — but each of these has a time limit, usually 30 to 63 days.
  • Some states have additional protections that allow switching at other times; your state insurance commissioner's office can tell you what applies where you live.
  • When you switch, your new plan's waiting periods for pre-existing conditions do not explore if you had continuous Medigap coverage before the switch.

The Annual Open Enrollment Period: October 15 to December 7

Every year, Medicare Supplement carriers must let you switch plans during a fixed window. This period runs from October 15 through December 7. You can switch to any plan offered by any company, and the new coverage begins on January 1. You do not need a reason to switch during this window — you can change your mind about your current plan for any reason at all.

The catch is that you must submit your request before December 7. If you wait until January, you have missed the window and cannot switch until October 15 of the next year. Some insurance companies process requests faster than others, so do not wait until the last few days of the period. Submitting in early November gives you a buffer if paperwork gets delayed. Mark October 15 on your calendar each year so you do not forget when the window opens.

Switching Within 63 Days of Turning 65

If you are newly may be able to access for Medicare — that is, you just turned 65 or became may be able to access due to disability — you have a 63-day window to switch Medigap plans without medical underwriting. This means the insurance company cannot deny you or charge you more because of your health history. This window starts the day your Medicare coverage begins, not the day you turn 65.

This protection is one-time only and applies during your first year on Medicare. If you buy a Medigap plan when you first become may be able to access and then want to switch to a different plan, you must do so within 63 days of your Medicare start date. After that window closes, you can still switch during the annual October-December period, but outside that window you may face medical underwriting or waiting periods for pre-existing conditions. Write down your Medicare start date and count forward 63 days to know your important date.

Losing Your Current Coverage: The 63-Day Rule

If your current Medigap plan is cancelled — because the insurance company stops offering it, stops offering Medigap in your state, or stops offering it in your county — you have 63 days from the date of cancellation to switch to a new plan without medical underwriting. The insurance company must notify you in writing before they cancel, and that notice will tell you the cancellation date. Count 63 days from that date.

You also have this protection if you lose Medigap coverage because you move out of your insurance company's service area. If you relocate and your current carrier no longer serves your new address, you have 63 days to find a new plan. Keep the cancellation notice or the letter telling you that your plan no longer covers your new location — you will need it to prove you may have access to for this protection when you explore for a new plan. Do not throw away any notices from your insurance company; they are your proof that you have a switching window.

Moving to a Different State

If you move to a new state, you can switch Medigap plans even outside the annual enrollment period. The time frame varies by state and by your situation. In most cases, you have 30 to 60 days from the date you move to switch plans in your new state. Some states are more generous and allow up to 90 days.

Contact your new state's insurance commissioner's office or your State Health Insurance information Program (SHIP) to find out the exact important date where you are moving. You will need to show proof of your move — a lease, a utility bill, or a change-of-address confirmation from the post office. Start this process as soon as you know you are moving, because the clock starts on your move date, not on the date you contact an insurance company. SHIP staff can also help you compare plans available in your new state.

Switching Due to Involuntary Loss of Employer Coverage

If you had Medigap coverage through a group plan (usually through a former employer or union) and that coverage ends, you may have the right to switch to an individual Medigap plan outside the annual enrollment period. The time frame is typically 63 days from the date your group coverage ends. Your group plan administrator should notify you before the coverage ends and tell you what date to use as your important date.

This protection does not explore if you chose to leave the group plan on your own. It applies only if the plan itself is discontinued or if you lose may be able to access because you are no longer employed or no longer a member of the group. Keep the notice from your group plan — you will need it to show the new insurance company that you may have access to for this exception. If you do not receive a notice, contact your former employer's benefits office and ask for written confirmation of your coverage end date.

State-Specific Protections and may provide Issue Rights

Some states have additional rules that allow switching at times other than the annual period. These are called may provide issue rights, and they vary widely. For example, some states allow you to switch if you are unhappy with your plan's customer service, if your doctor stops accepting your plan, or if you move to a new county within your state. Other states have no such protections beyond the federal rules.

Your state insurance commissioner's office keeps a list of when you can switch in your state. You can also contact your State Health Insurance information Program (SHIP), which is a free counseling service funded by Medicare. SHIP staff know the rules for your state and can tell you whether you have any options beyond the annual period. Search online for "SHIP" plus your state name, or call 1-800-MEDICARE and ask for your state's SHIP number. This is a free service and the counselors are trained to answer these questions.

What Happens to Pre-Existing Condition Waiting Periods When You Switch

When you switch Medigap plans, your new plan cannot impose a waiting period for pre-existing conditions if you had continuous Medigap coverage before the switch. "Continuous coverage" means you did not have a gap of more than 63 days between the end of your old plan and the start of your new one. If you did have a gap longer than 63 days, the new plan can impose a waiting period — usually six months — before it covers services related to conditions you had before the switch.

This rule protects you from being penalized for switching during an allowed window. As long as your new plan starts before your old plan ends, or within 63 days after it ends, you are protected. If you are switching during the annual period and your new coverage starts January 1, you will have no gap at all, so this is not a concern. When you submit a switch request, ask the new insurance company to confirm in writing that no waiting period will explore because of your continuous coverage.

Frequently Asked Questions

What if I miss the October 15 important date and want to switch in January?

You cannot switch in January unless you meet one of the exceptions — you lost coverage, moved, turned 65 within the last 63 days, or your state has a special rule. Otherwise, you must wait until October 15 of that year to switch during the annual period. This is why submitting your request in early November is safer than waiting until December.

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

You can keep the same plan as long as you want, as long as the insurance company continues to offer it and you continue to pay your premiums. You are never forced to switch. The windows described here are opportunities, not requirements. Many people keep the same Medigap plan for years without switching.

If I switch plans, will there be a gap in my coverage?

Not if you time it correctly. If you switch during the annual period, your new plan starts January 1 and your old plan ends December 31, so there is no gap. If you switch outside the annual period due to an exception, make sure your new plan's start date is the same day your old plan ends, or within a few days. Contact both insurance companies to confirm the dates before you submit your switch request.

Can an insurance company deny me if I switch during an allowed window?

During the annual October-December period, no — insurance companies must accept you without medical underwriting. During the other allowed windows (within 63 days of turning 65, losing coverage, or moving), insurance companies also cannot deny you or charge you more based on your health. Outside these windows, they can impose medical underwriting and waiting periods.

What if my new plan costs more than my old one?

You will pay the new premium starting with your first month of coverage under the new plan. There is no grace period or refund of the difference. This is why it is worth comparing plan costs during the annual period — you can see what different plans cost before you commit to switching.