Most of the time, no — your Medicare coverage continues automatically

If you are already enrolled in Medicare and do not make any changes, your coverage stays in place from year to year without you doing anything. You do not have to re-enroll or submit new paperwork each January. However, there are specific times when you must take action or your coverage will change — and missing these windows can cost you money or leave you without coverage you need.

The key is understanding when Medicare requires you to act and when it does not. Some people must enroll every year. Others can stay enrolled in the same plan indefinitely. And some face penalties if they do not make a choice during the right window, even if they want to keep what they have.

Key Takeaways

  • If you are enrolled in Original Medicare (Parts A and B), your coverage continues automatically each year with no action required on your part.
  • If you have a Medicare Advantage plan or a prescription drug plan, you can change plans during the Annual Enrollment Period (October 15 to December 7 each year), but you do not have to — your current plan renews automatically.
  • If you miss the Annual Enrollment Period and want to switch plans, you will need to wait until the next year unless you may have access to for a Special Enrollment Period due to a life event like moving or losing other coverage.
  • Failing to enroll in Part D (prescription drug coverage) when you first become may be able to access can result in a permanent penalty added to your premiums for as long as you have Medicare.
  • You should review your coverage each fall to make sure your doctors and medications are still covered under your current plan.

Original Medicare (Parts A and B) renews automatically

If you have Original Medicare — the federal program that covers hospital care (Part A) and doctor visits (Part B) — your enrollment continues year after year without any action from you. You pay your premiums, and your coverage stays active. There is no annual re-enrollment requirement, no form to sign, and no important date you need to meet.

This is true whether you enrolled at 65 or later, whether you are still working, or whether you have had Medicare for decades. As long as you pay your premiums on time, your Part A and Part B coverage will not lapse or require renewal.

The only time you need to take action with Original Medicare is if you want to make a change — such as adding a Medigap policy (supplemental coverage) or switching to a Medicare Advantage plan. Those changes happen during the Annual Enrollment Period or during a Special Enrollment Period if you may have access to.

Medicare Advantage and prescription drug plans renew but can be changed annually

If you have a Medicare Advantage plan (Part C) or a prescription drug plan (Part D), your plan automatically renews each January 1. You do not have to re-enroll or reapply. Your coverage continues under the same plan with the same premiums, deductibles, and network of doctors and pharmacies — unless the plan itself changes its terms for the coming year.

However, you have the right to change plans once per year during the Annual Enrollment Period, which runs from October 15 through December 7. During this window, you can switch to a different Medicare Advantage plan, drop Medicare Advantage and return to Original Medicare, add or change a prescription drug plan, or add a Medigap policy. Any changes you make take effect on January 1 of the following year.

If you do not make a change during the Annual Enrollment Period, your current plan straightforward continues. You are not required to switch plans, and staying in the same plan is a valid choice. Many people keep the same plan for years.

What happens if you miss the Annual Enrollment Period

If you want to change your Medicare Advantage or prescription drug plan but miss the October 15 to December 7 window, you generally cannot make that change until the next year's Annual Enrollment Period arrives. The exception is if you may have access to for a Special Enrollment Period, which is a separate window that opens for specific life events.

You may may have access to for a Special Enrollment Period if you move to a different state or county, lose your current coverage (such as employer coverage), gain Medicaid or lose Medicaid, have a change in your living situation, or experience certain other may have access to events. If you may have access to, you typically have 60 days from the event to make a change. You will need to contact Medicare or your plan directly to report the event and confirm that you are may be able to access.

If you do not may have access to for a Special Enrollment Period and you miss the annual window, you will remain in your current plan for another full year. This is why reviewing your coverage each fall is important — it gives you time to decide whether you want to stay or switch before the important date passes.

The Part D penalty for late enrollment

There is one situation where missing an enrollment important date has permanent consequences: prescription drug coverage. If you are may be able to access for Medicare and do not enroll in Part D (or in a Medicare Advantage plan that includes drug coverage) when you first become may be able to access, you may owe a late enrollment penalty for as long as you have Medicare.

The penalty is calculated as 1% of the national average Part D premium for each month you were may be able to access but not enrolled. If you delay enrollment by two years, for example, your penalty will be roughly 24% higher than the standard premium — and that extra amount stays with you permanently, even after you finally enroll. The penalty is recalculated each year based on the current national average premium.

There are exceptions: you do not owe a penalty if you had other creditable drug coverage (such as coverage through an employer or union) during the time you were not enrolled in Part D. You will need to provide proof of that coverage when you enroll. If you believe you may have access to for an exception, bring documentation to Medicare or your plan when you explore.

When to review your coverage each year

Even though you do not have to re-enroll, you should review your Medicare coverage every fall before the Annual Enrollment Period ends on December 7. Plans change their networks, formularies (the list of covered drugs), and premiums each year. A doctor who was in your plan's network last year might not be this year. A medication you take might no longer be covered, or it might move to a higher cost tier.

Start by checking whether your current doctors and specialists are still in your plan's network for the coming year. Then check whether your regular medications are still on the plan's formulary and at what cost tier. If you use the plan's website or call the plan directly, they can tell you this information. You can also use the Medicare Plan Finder tool on Medicare.gov to compare your current plan against other options available in your area.

If your doctors or medications are no longer covered, or if your out-of-pocket costs have risen significantly, the Annual Enrollment Period is your chance to switch to a plan that works better for you. If everything still works, you can straightforward let your plan renew automatically.

What documents you need to keep

Because you do not have to re-enroll each year, you do not need to submit new enrollment forms annually. However, you should keep your Medicare card and any plan documents in a safe place. When you see a doctor, you will present your Medicare card. When you fill a prescription, you will present your plan's pharmacy card or your Medicare number.

If your plan sends you a new card or updated plan documents in the fall, review them to make sure the information is correct. If you notice errors — such as a wrong name, date of birth, or plan name — contact your plan or Medicare to correct them before January 1.

You should also keep records of any life events that might may have access to you for a Special Enrollment Period, such as proof of a move, loss of employer coverage, or a change in Medicaid status. If you need to make an unscheduled change to your coverage, you will need to provide documentation of the may have access to event.

Frequently Asked Questions

Do I have to do anything in October or November to keep my Medicare coverage?

No. If you want to keep your current coverage exactly as it is, you do not have to do anything. Your coverage renews automatically on January 1. The Annual Enrollment Period (October 15 to December 7) is only for people who want to make a change. If you are happy with your plan, you can ignore the enrollment period entirely.

What if I turn 65 and become may be able to access for Medicare — do I have to enroll every year after that?

You enroll once when you first become may be able to access, and then your coverage continues automatically each year. You do not re-enroll. However, you can make changes to your coverage during each year's Annual Enrollment Period if you want to switch plans or add or drop coverage types.

Can I change my Medicare plan in January if I missed the December important date?

No, not unless you may have access to for a Special Enrollment Period. The Annual Enrollment Period ends on December 7, and changes made during that window take effect on January 1. If you miss the important date, you are locked into your current plan for the rest of the year. The next opportunity to change is the following October 15.

If I stay in the same Medicare Advantage plan for five years, do I have to re-enroll?

No. Your plan renews automatically each January 1 for as long as you want to stay in it. You never have to re-enroll in the same plan. You only take action if you want to switch to a different plan, and you can only do that during the Annual Enrollment Period or if you may have access to for a Special Enrollment Period.

What should I ask my doctor about my Medicare coverage?

Ask whether they are still in your plan's network for the coming year, whether they accept your plan's insurance, and whether there are any changes to how they bill Medicare. If you take medications, ask your pharmacist to check whether each one is still covered under your plan and at what cost tier. These conversations help you spot coverage gaps before January 1.