You do not need to re-enroll in Medicare each year once you are enrolled

Medicare enrollment is permanent. Once you sign up for Part A (hospital insurance) and Part B (medical insurance), you stay enrolled automatically unless you choose to drop coverage or switch plans. You do not have to repeat the enrollment process every January or at any other time during the year — your coverage continues without action on your part.

However, there is an important distinction: while your basic Medicare coverage stays in place, you have the option to change your coverage during specific windows each year. This is different from re-enrolling. If you are happy with your current plan, you do nothing. If you want to switch to a different plan — such as moving from Original Medicare to a Medicare Advantage plan, or changing which Medigap or Part D plan you use — you can do that during open enrollment periods, but it is not required.

Key Takeaways

  • Once you enroll in Medicare Part A and Part B, you remain enrolled automatically and do not need to re-enroll each year.
  • You can change your Medicare Advantage, Medigap, or Part D prescription drug plan during the annual open enrollment period (October 15 to December 7), but you are not required to make any changes.
  • If you miss the annual open enrollment window and want to switch plans, you may have to wait until the next year unless you experience a may have access to life event.
  • Your premium payments continue automatically if you receive Social Security; if you do not, you must pay your Part B premium directly to Medicare.

How continuous enrollment works

Your Medicare coverage does not expire or require renewal. Part A and Part B are yours for life once you turn 65 and enroll, or once you become may be able to access due to disability or end-stage renal disease. The Centers for Medicare & Medicaid Services (CMS) does not send you a renewal form or ask you to re-explore. Your enrollment record stays active in their system.

If you receive Social Security, your Part B premium is deducted automatically from your monthly benefit. If you do not receive Social Security, Medicare bills you directly — usually quarterly or monthly, depending on how you set up payment. As long as you pay your premiums, your coverage continues without interruption.

This is true even if you move to a different state, change jobs, or have a gap in income. Your Medicare status does not depend on your employment or where you live.

The difference between continuous enrollment and plan changes

Staying enrolled in Medicare is automatic. Changing which plan you use is optional and happens only during open enrollment or if you have a may have access to event.

If you have Original Medicare (Part A and Part B), you can keep that coverage indefinitely without making any changes. If you also have a Medigap policy (supplemental insurance) or a Part D plan (prescription drug coverage), those policies do have annual renewal periods, but they also continue automatically unless you cancel them or switch to a different policy.

If you have a Medicare Advantage plan (Part C), that plan also renews automatically each year. However, Medicare Advantage plans can change their benefits, costs, and provider networks from year to year. Even though you stay enrolled, the plan you are in may be different on January 1 than it was the previous year. This is why reviewing your plan during open enrollment is often a good idea, even if you do not plan to switch.

When you can change your Medicare plan

The main window for changing plans is the Annual Enrollment Period (AEP), which runs from October 15 to December 7 each year. During this time, you can switch from Original Medicare to Medicare Advantage, from Medicare Advantage back to Original Medicare, change from one Medicare Advantage plan to another, or change your Medigap or Part D plan. Any changes you make take effect on January 1 of the following year.

If you miss the October 15 to December 7 window, you generally cannot change plans until the next year's AEP — unless you experience a may have access to life event. These events include losing employer coverage, moving to a new service area, getting married or divorced, having a baby, or experiencing certain other changes in circumstances. If a may have access to event happens, you have a limited window (usually 60 days) to make changes outside of the regular enrollment period.

You can also switch from a Medicare Advantage plan back to Original Medicare during the Medicare Advantage Open Enrollment Period (MAOP), which runs from January 1 to March 31 each year. This window is only for dropping Medicare Advantage — you cannot use it to switch to a different Medicare Advantage plan.

What happens if you do nothing during open enrollment

If you do not make any changes during the Annual Enrollment Period, your current coverage continues exactly as it is. Your plan renews automatically, your premiums stay the same (unless your plan changes its rates), and your coverage does not lapse.

This is the default for most people. Many Medicare beneficiaries keep the same plan year after year without taking action during open enrollment. There is no penalty for not changing plans, and you do not have to do anything to keep your coverage active.

However, it is worth reviewing your plan each year to make sure it still meets your needs. Your health changes, your medications change, and plans change their costs and benefits. A plan that was a good fit last year might not be the best choice this year. But reviewing is optional — continuing with your current plan is always an option.

Keeping track of your enrollment status

You can check your current Medicare enrollment at any time by creating an account on Medicare.gov or by calling 1-800-MEDICARE (1-800-633-4227). Your account shows which parts of Medicare you are enrolled in, your current plan, your premium amounts, and your deductibles and copays.

Medicare sends you a notice each fall (usually in September or October) that lists your current coverage and reminds you of the open enrollment period. This notice is called the Annual Notice of Change (ANOC) for Medicare Advantage plans or the Evidence of Coverage (EOC) document. These documents explain any changes your plan is making for the coming year. Reading them can help you decide whether to stay with your current plan or explore other options.

You should also update your contact information with Medicare if you move or change your phone number, so you receive important notices about your coverage.

What to do if you want to change plans

If you decide during open enrollment that you want to switch plans, you have several options. You can enroll in a new plan online through Medicare.gov, by phone at 1-800-MEDICARE, or by contacting the plan directly. You can also work with a licensed insurance agent or counselor who specializes in Medicare — many of these services are free.

Your State Health Insurance information Program (SHIP) offers free, unbiased counseling about Medicare plans. You can find your local SHIP by visiting shiptalk.org or calling 1-877-839-2675. SHIP counselors can explain the differences between plans, help you understand costs, and walk you through the process of making changes.

If you are switching from one plan to another, make sure you understand when your old plan ends and when your new plan begins. Most changes take effect on January 1, so your old plan covers you through December 31 and your new plan starts on January 1. During the transition, make sure you have the right insurance card and that you understand which doctors and pharmacies are in your new plan's network.

Frequently Asked Questions

What happens to my Medicare if I do not pay my premium?

If you do not pay your Part B premium, your coverage will be terminated. Once your coverage ends, you cannot restart it until the next open enrollment period, and you may face a late enrollment penalty that increases your premium permanently. If you are having trouble paying, contact Medicare at 1-800-MEDICARE to discuss payment options or hardship programs.

Can I re-enroll in Medicare if I dropped my coverage?

If you dropped your coverage voluntarily, you generally cannot re-enroll until the next Annual Enrollment Period (October 15 to December 7). If you dropped coverage due to a may have access to life event, you may be able to re-enroll sooner. Contact Medicare to explain your situation and ask about your options.

Do I need to re-enroll if I turn 65 and am already on Medicare due to disability?

No. Your Medicare coverage automatically continues when you turn 65. There is no re-enrollment process. Your coverage straightforward transitions from disability-based Medicare to age-based Medicare, but your enrollment status and coverage remain the same.

What if I move to a different state?

Your Medicare enrollment stays active when you move. However, your plan's provider network may change, and you may have access to different plans in your new state. Review your coverage after you move to make sure your doctors and pharmacies are still in your plan's network. If they are not, you can change plans outside of the regular open enrollment period due to the move.

Do I need to do anything if my plan is being discontinued?

If your current plan is being discontinued, Medicare will notify you and automatically enroll you in a different plan unless you choose a different option during open enrollment. You will receive detailed information about the transition plan and your options. You should review this information carefully and decide whether to accept the automatic enrollment or switch to a plan you prefer.