Do You Need to Enroll in Medicare Every Year?

You do not need to enroll in Medicare every year once you are already enrolled

Once you are signed up for Medicare, your coverage continues automatically from year to year. You do not have to re-enroll or take any action to keep your coverage active. However, Medicare does have specific windows when you can make changes to your coverage — and missing these windows means you are locked into your current plan for another year.

The confusion usually comes from the difference between staying enrolled (automatic) and changing your coverage (requires action during open periods). If you are happy with your current plan, you do nothing. If you want to switch plans, join a prescription drug plan, or make other changes, you must act during the right time window or wait until the next one opens.

Key Takeaways

Your Medicare coverage renews automatically each January 1 without any action on your part.
The Annual Enrollment Period runs October 15 through December 7 each year, and this is when you can change plans or add prescription drug coverage.
If you miss the Annual Enrollment Period, you cannot change plans until the next October, unless you have a may have access to life event like moving or losing other insurance.
Your plan's costs, coverage rules, and drug formularies change each year, so reviewing your options during open enrollment is important even if you do not plan to switch.
Special Enrollment Periods allow changes outside the main window if you experience certain events like retirement, marriage, or relocation.

How automatic renewal works

Medicare automatically renews your coverage on January 1 of each year. Your plan continues under the same terms unless the plan is discontinued or you actively choose to switch. You will receive a notice in the mail before the new year showing your plan details and any changes to premiums, deductibles, or covered services.

This automatic renewal applies whether you have Original Medicare (Parts A and B), a Medicare Advantage plan (Part C), or a prescription drug plan (Part D). The renewal is passive — meaning you do not sign anything or submit paperwork. Your coverage straightforward continues unless you take action to change it.

The Annual Enrollment Period: October 15 to December 7

The Annual Enrollment Period is the main window each year when you can make changes to your Medicare coverage. It runs from October 15 through December 7. Any changes you make during this window take effect on January 1 of the following year.

During this period, you can switch from Original Medicare to a Medicare Advantage plan, switch between Medicare Advantage plans, add or change a prescription drug plan, or switch from a Medicare Advantage plan back to Original Medicare. You can make these changes online through Medicare.gov, by phone at 1-800-MEDICARE, or in person at a local Social Security office.

If you do not make any changes during this window, your current plan renews automatically on January 1. You cannot change plans again until the next Annual Enrollment Period unless you experience a may have access to life event.

What happens if you miss the enrollment window

If the Annual Enrollment Period ends on December 7 and you have not made a change, you are locked into your current plan for the entire next year. You cannot switch plans, add prescription drug coverage, or make other changes until October 15 of the following year.

The only exception is if you experience a may have access to life event. These events open a Special Enrollment Period, usually lasting 60 days, during which you can make changes outside the normal window. may have access to events include moving to a new state or county, losing other health insurance, getting married or divorced, becoming a U.S. citizen, or having a change in income that affects your Medicare costs.

If you believe you have had a may have access to event, contact Medicare at 1-800-MEDICARE to report it and ask whether you are may be able to access for a Special Enrollment Period.

Why you should review your plan each year even if you do not switch

Medicare plans change every year. Your current plan's premiums may increase, deductibles may change, the list of covered drugs may shrink, or your doctors may leave the network. Even if you plan to stay with your current plan, reviewing your options during the Annual Enrollment Period helps you understand what is changing and whether a different plan might work better.

Medicare sends you a notice called the "Annual Notice of Change" before the enrollment period begins. This notice lists changes to your plan for the coming year. You can also use the Medicare Plan Finder tool on Medicare.gov to compare all available plans in your area, see which doctors and pharmacies are in each network, and check which drugs are covered.

Many people discover during this review that a different plan would save them money or provide better coverage for their specific health needs. Taking 30 minutes to compare options can result in hundreds of dollars in savings over the year.

Special situations: When you can change plans outside the enrollment period

Beyond the Annual Enrollment Period, you can change your Medicare coverage if you experience certain life changes. These include moving to a different state or county, losing employer coverage, getting married or divorced, becoming a U.S. citizen, having a significant change in income, or being admitted to a skilled nursing facility.

You typically have 60 days from the date of your may have access to event to make changes. You must report the event to Medicare and provide documentation. For example, if you move, you may need to show a lease or utility bill. If you lose employer insurance, you may need a letter from your employer.

Contact Medicare at 1-800-MEDICARE as soon as a may have access to event occurs. Medicare staff can tell you whether your situation qualifies for a Special Enrollment Period and help you make changes if it does.

What to do before the enrollment period ends

Start reviewing your options in early October, before the October 15 enrollment period begins. Gather information about your current plan's changes for the coming year and compare it to other plans available in your area.

Use the Medicare Plan Finder at Medicare.gov to enter your current medications and preferred doctors. The tool will show you which plans cover your drugs and include your doctors in their networks. You can also call 1-800-MEDICARE to speak with someone who can walk you through your options.

Make your decision and submit your choice by December 7. If you are changing plans, confirm that your new plan's coverage begins on January 1. If you are adding a prescription drug plan, make sure your pharmacy is in the plan's network.

Frequently Asked Questions

What happens if I do not enroll in a prescription drug plan when I first become may be able to access?

If you do not join a prescription drug plan when you first become may be able to access for Medicare, you may face a late enrollment penalty. This penalty increases your Part D premium for as long as you have the coverage. You can join a drug plan during the Annual Enrollment Period, but the penalty will explore unless you have had continuous creditable coverage from another source.

Can I change from Original Medicare to a Medicare Advantage plan anytime?

You can change from Original Medicare to a Medicare Advantage plan during the Annual Enrollment Period (October 15 to December 7) or if you have a may have access to life event. You cannot switch plans at other times of the year unless you meet the requirements for a Special Enrollment Period.

Do I need to do anything if I want to keep the same plan next year?

No. Your plan renews automatically on January 1. You do not need to submit any paperwork or take any action. However, you should review the Annual Notice of Change to understand what is changing about your plan's costs and coverage.

What if my doctor leaves my Medicare Advantage plan's network?

If your doctor leaves your plan's network, you may be able to request a Special Enrollment Period to switch plans outside the normal enrollment window. Contact your plan or Medicare at 1-800-MEDICARE to report the change and ask whether you may have access to for an exception.

Can I switch back to Original Medicare from a Medicare Advantage plan anytime?

You can switch from a Medicare Advantage plan back to Original Medicare during the Annual Enrollment Period or if you have a may have access to life event. Outside these windows, you are locked into your Medicare Advantage plan for the year unless you meet the requirements for a Special Enrollment Period.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.