The main enrollment periods for Medicare

Medicare has three separate enrollment windows each year when you can sign up or change your coverage. Missing these windows usually means waiting until the next one opens, unless you have a may have access to life event like losing employer coverage or moving to a new state.

The three periods are: Initial Enrollment Period (when you first become may be able to access), General Enrollment Period (once a year in the spring), and Annual Enrollment Period (every fall). Each has different rules about what you can change and when coverage starts.

If you do not sign up when you are first may be able to access and do not have a may have access to reason for a late sign-up, you may pay a permanent penalty added to your premiums for as long as you have Medicare.

Key Takeaways

  • Your Initial Enrollment Period is the three months before, the month you turn 65, and the three months after — a seven-month window to sign up without penalty.
  • Annual Enrollment Period runs from October 15 through December 7 each year, when you can switch Medicare Advantage plans, add or drop prescription drug coverage, or change to Original Medicare.
  • General Enrollment Period is January 1 through March 31 each year, but coverage does not start until the month after you sign up, and you may pay a late penalty.
  • may have access to life events — like losing employer coverage, moving, or getting married — open a Special Enrollment Period lasting 60 days from the date of the event.
  • You must report life changes to Medicare within 60 days to keep your coverage steady and avoid gaps or unwanted plan switches.

Initial Enrollment Period: Your first chance to sign up

Your Initial Enrollment Period is a seven-month window centered on the month you turn 65. It includes the three months before your birthday, the month of your birthday, and the three months after. This is the easiest time to sign up because you will not face a late penalty no matter when in this window you enroll.

If you sign up in the month you turn 65 or earlier, your Medicare coverage starts on the first day of the month you turn 65. If you sign up in the month after you turn 65, coverage starts the first day of the following month. If you sign up in the second or third month after your birthday, coverage starts two months later.

For example, if you turn 65 on June 15, your Initial Enrollment Period runs from March through September. If you sign up in June, coverage starts July 1. If you sign up in August, coverage starts October 1.

Annual Enrollment Period: The yearly open window

Annual Enrollment Period, also called the fall open enrollment, runs from October 15 through December 7 each year. This is when almost all Medicare members can make changes to their coverage without needing a special reason.

During this period, you can switch from Original Medicare to a Medicare Advantage plan, switch from one Medicare Advantage plan to another, add prescription drug coverage (Part D), drop prescription drug coverage, or switch prescription drug plans. Any changes you make take effect on January 1 of the following year.

This is the most common time for people to review their coverage because it happens at the same time every year and gives you a full month and a half to make decisions.

General Enrollment Period: The spring backup window

General Enrollment Period runs from January 1 through March 31 each year. You can use this window to sign up for Medicare or switch plans if you missed Annual Enrollment Period, but there are two important catches.

First, coverage does not start until the month after you sign up. If you enroll in January, coverage starts February 1. If you enroll in March, coverage starts April 1. Second, if you are signing up late (after your Initial Enrollment Period ended), you will likely owe a permanent late penalty added to your premiums.

General Enrollment Period is a safety net, but it is slower and more expensive than signing up during your Initial Enrollment Period or Annual Enrollment Period.

Special Enrollment Periods: When life changes open a window

A Special Enrollment Period is a 60-day window that opens when certain life events happen. These events include losing employer coverage, moving to a new state, getting married or divorced, having a baby, or becoming a U.S. citizen.

If a may have access to event happens, you have 60 days from the date of the event to sign up or make changes without waiting for Annual Enrollment Period. You must report the change to Medicare within 60 days to keep your coverage from being interrupted or to avoid unwanted plan switches.

Common may have access to events are: losing health coverage through an employer or spouse's employer, moving out of your plan's service area, getting married, getting divorced, having a baby or adopting a child, becoming a U.S. citizen, or being released from incarceration. If you are unsure whether your situation qualifies, contact Medicare at 1-800-MEDICARE to ask.

What happens if you miss the enrollment periods

If you do not sign up during your Initial Enrollment Period and do not have a may have access to life event, you will have to wait until General Enrollment Period (January 1 through March 31) to sign up. Your coverage will not start until the month after you enroll, and you will owe a permanent late penalty.

The late penalty for Part B (medical insurance) is 10 percent of the standard premium for each full year you were may be able to access but not enrolled. The late penalty for Part D (prescription drugs) is 1 percent of the national average premium for each month you were may be able to access but not enrolled. These penalties stay on your premiums for as long as you have Medicare.

The only exceptions are if you had creditable coverage (health insurance that is at least as good as Medicare) through an employer or union, or if you are a federal employee or retiree. In those cases, you may be able to sign up later without a penalty.

How to sign up during each period

You can sign up for Medicare through three main routes: online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.

Online signup through Medicare.gov is available 24 hours a day. You will need your Social Security number, birth date, and information about any current health coverage. The process takes about 15 to 20 minutes.

By phone, a Medicare representative can walk you through the process and answer questions. Wait times are usually shorter early in the morning or on weekdays. In person, a Social Security representative can help you complete the process and answer questions about your specific situation.

If you are already receiving Social Security benefits, you may be signed up automatically for Medicare Part A and Part B when you turn 65. Check your Social Security statement or call 1-800-MEDICARE to confirm whether you have been enrolled.

Frequently Asked Questions

What if I turn 65 while still working and have employer coverage?

You can delay signing up for Medicare Part B (medical insurance) without penalty as long as you have employer coverage and are actively working. You have eight months after you leave your job or lose coverage to sign up without a late penalty. You must still sign up for Part A (hospital insurance) during your Initial Enrollment Period, even if you have employer coverage.

Can I change my mind after I sign up during Annual Enrollment Period?

No. Once the Annual Enrollment Period ends on December 7, your plan changes are locked in for the year. You cannot switch plans again until the next Annual Enrollment Period unless you have a may have access to life event that opens a Special Enrollment Period.

Do I have to sign up for prescription drug coverage if I do not take many medications?

You do not have to sign up for Part D, but if you go without it and sign up later, you will owe a late penalty. The penalty is 1 percent of the national average premium for each month you were may be able to access but not enrolled, and it stays on your premiums permanently. If you think you might need prescriptions in the future, it is usually cheaper to sign up now.

What counts as a may have access to life event for a Special Enrollment Period?

may have access to events include losing employer coverage, moving to a new state or out of your plan's service area, getting married or divorced, having a baby or adopting, becoming a U.S. citizen, and being released from incarceration. Some plans also allow enrollment if you become may be able to access for Medicaid or lose Medicaid coverage. Call 1-800-MEDICARE to confirm whether your situation qualifies.

If I miss the important date, can I still sign up later?

Yes, but with limits. You can sign up during General Enrollment Period (January 1 through March 31), but coverage will not start until the month after you enroll, and you will owe a permanent late penalty. If you have a may have access to life event, you can sign up during a Special Enrollment Period without penalty.