Medicare Special Enrollment Period

When specific events happen in your life — such as losing employer health insurance or moving to a new home — you can make changes to your Medicare coverage. This is known as a special enrollment period.

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What Is a Medicare Special Enrollment Period?

Certain life events and situations qualify you for a Medicare special enrollment period. There are more than 20 qualifying special circumstances listed by the U.S. Centers of Medicare & Medicaid Services.

Rules about when you can make changes to your Medicare plan and the type of changes you can make vary for each special enrollment situation.

If you miss your special enrollment period window, you may have to wait until the next Medicare open enrollment period, which takes place every year from Oct. 15 to Dec. 7.

A special enrollment period is different from your initial enrollment period, or the time when you first become eligible for Medicare.

For most people, this period starts three months before your 65th birthday and ends three months after your birth month.

During a special enrollment period, you may be able to:
  • Enroll in Medicare Part A and/or Part B.
  • Enroll in a Medicare Part D prescription drug plan.
  • Switch from one Medicare Advantage plan to another.
  • Switch from one Part D plan to another.
  • Drop you Part D drug plan completely.
  • Drop your Medicare Advantage plan and return to Original Medicare.
Medicare doesn’t consider COBRA or other retiree health plans as coverage based on current employment. You will not qualify for a special enrollment period when your COBRA coverage ends.

Types of Special Enrollment Periods

Certain situations qualify you for a special enrollment period. For a full list of situations, visit

Common Types of Special Enrollment Periods
Change of Residence
If you’re enrolled in a Medicare Advantage or Part D drug plan and move to an area outside your plan’s network, you qualify for a special enrollment period. During this time, you may return to Original Medicare (Part A and Part B) or you can switch to a new Medicare Advantage or Part D plan. Your enrollment window begins the month you tell your plan provider and lasts two more full months after that.
Loss of Employer Health Insurance
If you receive health insurance through an employer’s group health plan (or your spouse’s employer plan), you can delay Medicare Part A and/or Part B. To delay coverage, your employer must have at least 20 employees. Ask your benefits manager at work whether you have group health plan coverage as defined by the Internal Revenue Service. Once you leave your job or lose your health insurance (whichever comes first), you have an eight-month special enrollment period when you can sign up for Medicare without facing a late enrollment penalty.
Other Coverage Losses
You may be able to drop your current Medicare coverage during a special enrollment period if you have a choice to enroll in other coverage through your employer or union. You can also drop Medicare anytime if you choose to enroll in coverage from the U.S. Department of Veteran Affairs or a Program for All-Inclusive Care for the Elderly (PACE) plan.

Other situations also qualify you for special enrollment.

If you are a U.S. citizen returning to the United States after living outside the country, your Medicare special enrollment period begins the month you move back to America and lasts for two full months after that.

If you are released from jail, similar rules apply. Your chance to join a Medicare health or drug plan lasts two full months after the month you’re released from jail.

Frequently Asked Questions About Medicare Special Enrollment Period

Are there special enrollment periods for the Extra Help program?
If you become eligible for Medicare’s Extra Help program, you can switch your current Medicare prescription drug coverage plan one time during the following periods: January to March, April to June and July to September. Any changes go into effect on the first day of the following month.
Do I need to sign up for Medicare if I’m enrolled in coverage through the Health Insurance Marketplace?
It’s recommended you sign up for Medicare when you first become eligible, even if you’re currently enrolled in a Marketplace plan. Otherwise, if you try to enroll in Medicare after your initial enrollment period ends, you may have to pay a Part B late penalty for as long as you have Medicare.
Do Medicare Part B penalties apply for special enrollment periods?
If you had health insurance through your job or your spouse’s job when you first became eligible for Medicare Part B, you will have a Part B special enrollment period once you retire or lose your employer health care. You will not face a Medicare Part B penalty if you enroll during this time.
Last Modified: September 29, 2021

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  5. (n.d.). Special enrollment periods if you get Extra Help. Retrieved from