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When to enroll in Medicare September 30, 2025 Medicare Health Insurance Basics 2 MINUTE READ

The first step to picking your Medicare plan is understanding what Medicare is, then you can create your ideal coverage. But you also need to know when and how to enroll.

Initial Enrollment Period

Your Initial Enrollment Period is when you are first eligible to enroll in Medicare. This applies to all Medicare parts: Original Medicare, Medicare Advantage, Medicare Supplement, and Medicare Part D. If you don’t sign up for Medicare Part B when you’re first eligible, Medicare will require you to pay a late enrollment penalty.

Your Initial Enrollment Period is:

  • The month when you turn 65
  • 3 months before you turn 65
  • 3 months after you turn 65

Before you enroll, you’ll want to confirm your month of eligibility. To see when you’re eligible, visit the Social Security Administration's website or call 800-772-1213 (TTY: 800-325-0778).

Additional enrollment periods

As your needs or budget change over time, you may find yourself wanting to change plans. You can make changes to your plan during the following enrollment periods.

Annual Enrollment Period

When: Each year from October 15 through December 7

What you can do:

  • Switch from Original Medicare / Medicare Supplement to Medicare Advantage
  • Switch from Medicare Advantage to Original Medicare / Medicare Supplement 
  • Change Medicare Advantage plans
  • Add or drop a standalone Medicare Prescription Drug Plan (PDP)
Open Enrollment Period

When: Each year from January 1 through March 31

What you can do:

  • Change Medicare Advantage plans
  • Drop your Medicare Advantage Plan and return to Original Medicare / Medicare Supplement
  • If returning to Original Medicare, you also have the option at this time to purchase a standalone Medicare Prescription Drug Plan (PDP).
Special Enrollment Period

When: You may make changes to your plan any time your situation qualifies. For example, if you happen to move to a home outside your service area, you are allowed to change plans.

What you can do, if eligible:

  • Switch from Original Medicare / Medicare Supplement to Medicare Advantage
  • Switch from Medicare Advantage to Original Medicare / Medicare Supplement 
  • Change Medicare Advantage plans
  • Join, switch or drop a standalone Medicare Prescription Drug Plan (PDP)

For more information on Special Enrollment Period, visit Medicare.gov.

Changing Medicare Supplement plans

Typically, you can only change Medicare Supplement plans when your plan is up for renewal – once each year in May. You may also have to answer additional health questions to be accepted into the new plan. 

Blue Cross and Blue Shield of North Carolina (Blue Cross NC) gives you additional flexibility, allowing you to change Medicare Supplement plans during Annual Enrollment Period – without additional medical exams, underwriting or health questions. You can also switch from Medicare Advantage to Original Medicare + Blue Medicare Supplement without underwriting during this time.

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Once you've found your ideal coverage, you'll want to know how and when to enroll.

For retirees, you can enroll during your initial enrollment period, which runs from three months before your 65th birthday until three months after your birthday.

If you're not retiring at 65, talk to your HR benefit specialist about your Medicare options while you're still employed.

You'll have opportunities to change plans each year, depending on which plan you are enrolled in. During the annual enrollment period, anyone with Medicare can change their coverage. Annual enrollment runs from October 15 through December 7.

During the open enrollment period, those with Medicare Advantage can switch plans. Open enrollment runs from January 1 through March 31.

Members who have Blue Medicare supplement plans can change plans during renewal or during an additional designated period with our Blue to Blue program. Blue Cross and Blue Shield of North Carolina gives you the flexibility to switch Medicare supplement plans without additional health questions or medical exams between October 1 and December 31 of each year.

Blue to Blue is just one of the many ways we make planning for your future a little easier.

To learn more about Blue Medicare or to enroll, visit us at medicare.bluecrossnc.com.

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Browse related articles

What is Medicare?

Understanding the four parts of Medicare.

Planning your Medicare coverage

Understand the different pieces of coverage.

Medicare parts A, B, C, and D explained

Be prepared to make the best coverage choice for you.

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