You do not have to enroll every year if you are already signed up

Once you are enrolled in Medicare, your coverage continues automatically each year unless you make a change. You do not need to do anything during the yearly enrollment period if you want to keep the same plan. However, there is a window each year when you can make changes if you want to switch plans, and understanding when that window opens matters — because missing it can lock you into your current coverage for a full year.

The rules are different depending on whether you have Original Medicare (Parts A and B) or a Medicare Advantage plan (Part C). Both have automatic renewal, but the timing and your options during the enrollment period are not the same.

Key Takeaways

  • Your Medicare coverage renews automatically each January 1 without any action on your part if you want to stay in the same plan.
  • The Annual Enrollment Period runs from October 15 to December 7 each year, and this is when you can switch plans or add prescription drug coverage.
  • If you miss the October 15 to December 7 window, you cannot change plans until the next year unless you have a may have access to life event like moving or losing employer coverage.
  • Original Medicare (Parts A and B) renews automatically, but if you have a Medicare Advantage plan, you should review it each year because plan details and costs change.
  • If you are newly may be able to access for Medicare, you have an Initial Enrollment Period of seven months around your 65th birthday, and missing it can result in permanent late-enrollment penalties.

The Annual Enrollment Period: When you can make changes

Every year from October 15 to December 7, Medicare opens a window for you to make changes. During this time, you can switch from Original Medicare to a Medicare Advantage plan, switch from one Medicare Advantage plan to another, add or drop prescription drug coverage (Part D), or switch prescription drug plans. Any changes you make take effect on January 1 of the following year.

This is the only time most people can change plans. If you do not make a change during these dates, your current plan continues into the new year exactly as it is. The exception is if you experience a may have access to life event — such as moving to a different state, losing employer coverage, or becoming may be able to access for Medicaid — which can open a Special Enrollment Period outside the regular October-to-December window.

Original Medicare: Automatic renewal with no action needed

If you have Original Medicare (Part A and Part B), your coverage automatically renews on January 1 each year. You do not need to do anything. Your Medicare card remains valid, and you can continue seeing any doctor or hospital that accepts Medicare.

However, you should still review your coverage each year during the Annual Enrollment Period, especially if you have a separate prescription drug plan (Part D) or a Medigap supplemental policy. Prescription drug plans and Medigap plans change their costs and coverage details every year, and you may find a better option for your needs and budget. Even though your Original Medicare itself does not require action, switching to a different prescription drug plan or Medigap plan must happen during the October 15 to December 7 window.

Medicare Advantage plans: Automatic renewal but review each year

Medicare Advantage plans (Part C) also renew automatically on January 1. You do not have to re-enroll. However, Medicare Advantage plans change their networks, costs, and covered services every year, sometimes significantly. A doctor who was in your plan's network last year may not be this year. A medication that was covered may move to a higher cost tier. Your out-of-pocket maximum may increase.

For this reason, you should review your Medicare Advantage plan during the Annual Enrollment Period each October through December. If the changes do not work for you, you can switch to a different Medicare Advantage plan or switch to Original Medicare plus a prescription drug plan. This is your only chance to make that change until the next year.

What happens if you miss the enrollment window

If you do not make a change during the October 15 to December 7 Annual Enrollment Period, you are locked into your current plan for the entire next year. You cannot switch plans, add coverage, or drop coverage until the following October, with very limited exceptions.

The main exception is a may have access to life event. If you move to a different state, lose employer health coverage, become newly may be able to access for Medicaid, get married, have a baby, or experience certain other changes, you may open a Special Enrollment Period that allows you to change plans outside the regular window. You typically have 60 days from the event to make your change. However, you must report the event to Medicare and provide documentation — straightforward wanting a different plan is not enough.

Initial enrollment when you first turn 65

The rules are stricter when you are first becoming may be able to access for Medicare. You have a seven-month Initial Enrollment Period centered on the month you turn 65: three months before, the month you turn 65, and three months after. During this window, you can enroll in Medicare without penalty.

If you do not enroll during your Initial Enrollment Period and you do not have other may have access to coverage (such as active employer health insurance), you will face a permanent late-enrollment penalty. For Part B, the penalty is 10 percent of the standard premium for each full year you were may be able to access but not enrolled, and this penalty stays with you for life. For Part D prescription drug coverage, the penalty is 1 percent of the national average premium for each month you were may be able to access but not enrolled. These penalties are added to your monthly premium.

How to make changes during the enrollment period

To change your Medicare plan during the Annual Enrollment Period, you can visit Medicare.gov, call 1-800-MEDICARE, or visit your local Social Security office. You can also contact the plans directly to compare them. Many people use the Medicare Plan Finder tool on Medicare.gov, which shows all available plans in your area, their costs, and their coverage details side by side.

If you need help understanding your options, you can contact your State Health Insurance information Program (SHIP), which offers free counseling about Medicare. You can find your local SHIP by visiting shiptalk.org or calling 1-877-839-2675. SHIP counselors can walk you through the changes available to you and help you understand how different plans would affect your costs and coverage.

Frequently Asked Questions

What if I turn 65 in the middle of the year?

Your Initial Enrollment Period is seven months long: three months before the month you turn 65, the month you turn 65, and three months after. If you turn 65 in June, your enrollment period runs from March through September. You should enroll as early as possible in this window so your coverage starts on the first of the month you turn 65 or shortly after.

Can I change my Medicare plan more than once during the enrollment period?

Yes. Between October 15 and December 7, you can change plans multiple times. However, only your final change will take effect on January 1. If you switch plans twice, the second plan is the one that will cover you starting January 1, so make sure your last choice is the one you want.

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

may have access to events include moving to a different state, losing employer coverage, becoming newly may be able to access for Medicaid, getting married or divorced, having a baby or adopting a child, and a few others. You must report the event to Medicare and provide proof, usually within 60 days. Contact Medicare at 1-800-MEDICARE to report an event and learn about you may have access to for a Special Enrollment Period.

Do I have to pay a penalty if I did not enroll when I first turned 65?

If you did not enroll during your Initial Enrollment Period and you did not have other may have access to health coverage, you will owe a permanent late-enrollment penalty on your Part B and Part D premiums. The penalty for Part B is 10 percent of the standard premium for each full year you were may be able to access but not enrolled. You can still enroll now, but the penalty will be added to your premium for life.

What if I want to keep my current plan and do nothing?

You do not need to do anything. Your plan will renew automatically on January 1. However, you should still review your plan during the enrollment period to make sure the costs and coverage still work for you, since plans change every year. Even if you decide to keep your plan, it is worth spending a few minutes checking whether a different plan might save you money.