Medicare Initial Enrollment Period

Your 7-month window to enroll, explained. Call 1-800-MEDIGAP.

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Quick answer

The Medicare Initial Enrollment Period (IEP) is the seven-month window to first sign up for Medicare. It begins three months before the month you turn 65, includes your birthday month, and ends three months after. Enrolling early means coverage starts the first day of your birthday month.

Your Initial Enrollment Period is your first and simplest chance to join Medicare. Here are the exact dates and rules.

When is the Initial Enrollment Period?

Your IEP spans seven months: the three months before your 65th birthday month, your birthday month itself, and the three months after. For example, if you turn 65 in June, your IEP runs March 1 through September 30. When you enroll matters for your start date. Signing up in the first three months means coverage begins the first day of your birthday month, while enrolling later pushes your start date back. This is the easiest, penalty-free way for most people to join Medicare. Call 1-800-MEDIGAP to confirm your exact window.

Why is the Initial Enrollment Period so important?

Enrolling during your IEP avoids two costly problems: late-enrollment penalties and gaps in coverage. Miss it without other creditable coverage, and Part B adds a permanent 10% penalty for each 12 months you delay, while Part D adds its own lifelong surcharge. Your IEP is also tied to your six-month MEDIGAP Open Enrollment Period, the one time you can buy any Medicare Supplement plan with no medical underwriting. Acting on time protects both your wallet and your access to coverage. Call 1-800-MEDIGAP to enroll correctly.

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Frequently asked questions

What is the Medicare Initial Enrollment Period?+

It is the seven-month window when you first become eligible for Medicare, starting three months before your 65th birthday month, including that month, and ending three months after. Enrolling during this period avoids late penalties for most people. Call 1-800-MEDIGAP.

When does my Initial Enrollment Period start?+

It starts three months before the month you turn 65. For example, if your birthday is in June, your IEP begins March 1. Enrolling in those first three months means coverage starts the first day of your birthday month. Call 1-800-MEDIGAP to confirm.

What happens if I miss my Initial Enrollment Period?+

If you miss your IEP without other creditable coverage, you may face permanent Part B and Part D late penalties and have to wait for the General Enrollment Period to sign up, causing a coverage gap. Call 1-800-MEDIGAP right away to explore your options.

Does the Initial Enrollment Period apply to MEDIGAP?+

Your MEDIGAP Open Enrollment Period is separate but related: it is a six-month window starting when you are 65 and enrolled in Part B, during which you can buy any MEDIGAP plan with no health questions. Call 1-800-MEDIGAP to use this window wisely.

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