What Medicare Open Enrollment Is

Medicare Open Enrollment is a set period each year when you can change your Medicare coverage without penalty. During this window, you can switch from Original Medicare to a Medicare Advantage plan, move between Medicare Advantage plans, add or drop prescription drug coverage, or switch back to Original Medicare. Outside this period, you generally cannot make these changes unless you have a may have access to life event — and if you miss the important date, you may pay higher premiums for the rest of the year.

Open Enrollment runs from October 15 through December 7 each year. Any changes you make take effect on January 1 of the following year. This is different from the Initial Enrollment Period, which is the first time you become may be able to access for Medicare and lasts three months. It is also separate from Special Enrollment Periods, which allow changes outside the annual window if you move, lose other coverage, or experience certain other events.

Key Takeaways

  • Open Enrollment runs October 15 through December 7 each year, and changes take effect January 1.
  • You can switch between Original Medicare and Medicare Advantage plans, add or drop Part D prescription drug coverage, or change Medigap policies during this period.
  • If you miss the important date and have no may have access to life event, you cannot change plans until the next Open Enrollment — and late enrollment penalties may explore.
  • You do not need to take any action if you are happy with your current plan; coverage continues automatically into the new year.
  • Medicare.gov, your plan's website, and 1-800-MEDICARE can help you compare plans and understand your options before the important date.

When Open Enrollment Happens and How Long It Lasts

Open Enrollment occurs once per calendar year, from October 15 through December 7. This eight-week window is the only time most people can make changes to their Medicare coverage. The important date is firm: if your request is received by December 7, your new coverage starts January 1. If you miss December 7, you will remain in your current plan unless you have a may have access to event that opens a Special Enrollment Period.

The timing is intentional. Medicare uses these months to process millions of plan changes, and the January 1 start date gives insurers time to update their systems. It also gives you time to review your current plan's costs and coverage against other options before the year ends. Many people receive their plan's annual notice of changes in September or early October, which is meant to give you information to use during Open Enrollment.

What You Can Change During Open Enrollment

During Open Enrollment, you have several options. If you are on Original Medicare, you can switch to a Medicare Advantage plan. If you are on a Medicare Advantage plan, you can switch to a different Medicare Advantage plan or return to Original Medicare. You can add Part D prescription drug coverage if you do not have it, drop Part D if you do, or switch to a different Part D plan. If you have a Medigap policy (supplemental insurance), you can switch to a different Medigap plan offered in your state.

You cannot change your choice of Part A or Part B coverage itself — those are determined by your age and work history — but you can change how you receive them. For example, you can move from Original Medicare (where you choose your own doctors) to Medicare Advantage (where you use a network), or vice versa. Each change has different costs and coverage rules, so comparing your options before the important date is important.

How to Review Your Current Plan and Compare Alternatives

Start by reviewing your current plan's costs and coverage. Look at your plan's annual notice of changes, which explains what is changing for the coming year — premiums, deductibles, copays, and which doctors and pharmacies are in the network. If your medications, doctors, or hospitals are changing coverage status, that is a signal to compare other plans.

Use Medicare.gov's Plan Finder tool to compare plans available in your area. Enter your zip code, current medications, and preferred doctors and hospitals, and the tool will show you plans ranked by estimated out-of-pocket costs. You can also call 1-800-MEDICARE to speak with a counselor who can walk you through your options. Many states also have State Health Insurance information Programs (SHIPs) that offer free, one-on-one counseling. Your current plan's website and customer service line can also answer questions about what is changing in your plan for the new year.

What Happens If You Miss the Open Enrollment important date

If December 7 passes and you have not made a change, your current coverage continues into the new year without interruption. However, if you wanted to switch plans and missed the important date, you cannot do so until the next Open Enrollment period — which is almost a full year away — unless you have a may have access to life event.

may have access to events include losing other health coverage, moving to a new state or county, 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 time (usually 60 days from the event) to make changes outside the normal Open Enrollment window. If you miss that window too, you are locked in until the next October 15.

Missing the important date can also trigger late enrollment penalties. If you do not have Part D prescription drug coverage and go 63 or more days without it, you may pay a permanent penalty when you eventually join a plan. Similarly, if you do not have continuous Medicare Advantage or Medigap coverage and go without coverage for more than 63 days, penalties may explore. These penalties are calculated based on how long you went without coverage and can add to your premiums for years.

Common Mistakes to Avoid During Open Enrollment

One of the biggest mistakes is waiting until the last week of December to make a change. If you submit your request in late December, it may not be processed in time for a January 1 start date, and you could end up without coverage or stuck in your old plan. Submit your change by early December to leave room for processing delays.

Another mistake is assuming your current plan will stay the same. Plans change every year — premiums go up, deductibles shift, doctors leave networks, and formularies (the list of covered drugs) are updated. Even if you were happy with your plan last year, it may not be the best choice this year. Set aside time in October to review what is changing.

A third mistake is not checking whether your doctors and pharmacies are still in your plan's network. If your primary care doctor is no longer in-network and you do not notice until January, you may have to switch doctors or pay out-of-network rates. Use your plan's provider directory or call the plan to confirm before you commit to staying.

How to Make Your Change

You have three main ways to change your plan during Open Enrollment. The first is online at Medicare.gov. Log in to your account, go to the "Manage Your Health Coverage" section, and follow the prompts to make your change. The second is by phone: call 1-800-MEDICARE and speak with a representative who can help you switch. The third is to contact your new plan directly — most plans have a phone number and website where you can request enrollment.

Whichever method you use, have your Medicare card handy and be ready to provide your name, date of birth, and Medicare number. If you are switching plans, you do not need to cancel your old plan — Medicare will handle that automatically when your new coverage starts on January 1. However, if you are switching from Original Medicare to Medicare Advantage, make sure you understand what happens to any Medigap policy you have; you may need to cancel it separately to avoid paying for coverage you no longer need.

Frequently Asked Questions

Do I have to do anything if I want to keep my current plan?

No. If you are satisfied with your current coverage, you do not need to take any action. Your plan will automatically renew on January 1 with the new rates and coverage terms for that year. However, you should still review your plan's annual notice of changes to understand what is different, especially if your medications or doctors are affected.

What if I turn 65 during Open Enrollment?

If you turn 65 during October, November, or December, you are in your Initial Enrollment Period, not Open Enrollment. Your Initial Enrollment Period lasts three months and includes the month you turn 65, plus one month before and one month after. You can make your first Medicare choices during that window, and coverage can start as early as the first day of the month you turn 65.

Can I change my plan more than once during Open Enrollment?

Yes, you can make multiple changes during the Open Enrollment period. However, only your final request will be processed. If you switch from Plan A to Plan B on November 1 and then change your mind and switch to Plan C on November 20, only the Plan C enrollment will go through. Make sure you are certain about your choice before submitting your final request.

What if my plan is being discontinued?

If your current plan is ending, Medicare will notify you in advance and you will be required to choose a new plan during Open Enrollment. Medicare will often assign you to a similar plan automatically if you do not make a choice, but you should still review your options to make sure the new plan meets your needs. The notification will explain your options and the important date for choosing.

Can I change my plan if I move to a different state?

Yes. If you move to a new state or county, you have a Special Enrollment Period that lasts 60 days from the date you move. This allows you to change plans outside the normal October 15 to December 7 window. Contact Medicare or your plan to report your move and explore plans available in your new location.