When You Can Switch Medicare Plans
You can change Medicare plans during specific windows each year, and the timing depends on which type of plan you have and what kind of change you want to make. If you have Original Medicare (Parts A and B), you can switch to a Medicare Advantage plan or add prescription drug coverage during the Annual Enrollment Period, which runs October 15 to December 7 each year. If you already have a Medicare Advantage plan or a Part D prescription drug plan, you can switch to a different plan during that same window. Outside these periods, changes are generally blocked — with a few exceptions for people in specific situations.
The rules exist because Medicare needs a stable enrollment period to process millions of changes and send updated cards and information to beneficiaries. Missing the window means you stay in your current plan for another full year, or you may face a late enrollment penalty if you drop coverage and try to rejoin later. Understanding which period applies to you and what you can change during it prevents costly mistakes.
Key Takeaways
- The Annual Enrollment Period runs October 15 to December 7 each year and is when most people can switch any Medicare plan or add prescription drug coverage.
- Changes made during Annual Enrollment take effect January 1 of the following year, so you must act before December 7 to change plans for next year.
- If you miss the Annual Enrollment Period, you can only change plans if you have a may have access to life event, such as losing employer coverage, moving to a new state, or becoming may be able to access for Medicaid.
- Some people with Original Medicare can switch to Medicare Advantage during a separate Initial Coverage Election Period if they are newly may be able to access for Medicare.
- Penalties explore if you go without Part D prescription drug coverage for more than 63 days in a row, even if you rejoin during a later enrollment period.
The Annual Enrollment Period: October 15 to December 7
The Annual Enrollment Period is the main window when you can change any Medicare plan. It opens on October 15 and closes on December 7 each year. During this time, you can switch from Original Medicare to a Medicare Advantage plan, switch from one Medicare Advantage plan to another, switch from Medicare Advantage back to Original Medicare, add Part D prescription drug coverage, or switch to a different Part D plan. You can also change your Medigap supplemental insurance plan during this period, though Medigap has slightly different rules depending on your state and age.
Any changes you make during the Annual Enrollment Period take effect on January 1 of the next year. This means if you decide to switch plans in November, your new plan starts on January 1, not when ready. Your old plan ends on December 31. You will receive a new Medicare card in the mail before January 1 showing your new plan information. If you do not receive a card by late December, contact your new plan directly to confirm your enrollment.
The important date is firm: changes submitted after December 7 at 11:59 p.m. Eastern Time are not processed for the following year. If you miss the important date, you remain in your current plan unless you may have access to for a Special Enrollment Period (see below).
Special Enrollment Periods: Changing Plans Outside the Annual Window
A Special Enrollment Period allows you to change Medicare plans outside the Annual Enrollment Period if you experience a may have access to life event. These events include losing employer-sponsored health coverage, moving to a new state or county, becoming newly may be able to access for Medicaid or Extra Help (a program that helps pay Part D costs), getting married or divorced, or having a significant change in your health status that makes your current plan unsuitable. Some people also may have access to if they are in a Medicare Advantage plan and their plan is being discontinued or significantly changed.
When you have a may have access to event, you typically have 60 days from the date the event occurs to make a change. For example, if you lose employer coverage on March 15, you have until May 14 to switch plans. The exact timing varies by the type of event, so you should contact Medicare or your plan as soon as the event happens to confirm your window. Changes made during a Special Enrollment Period usually take effect the first of the month following your request, though some take effect when ready.
You will need to provide proof of the may have access to event — such as a letter from your employer stating your coverage ended, a lease showing your new address, or a Medicaid approval notice. Keep these documents with your Medicare records.
Initial Coverage Election Period: For People Newly may be able to access for Medicare
When you first become may be able to access for Medicare at age 65 (or earlier if you may have access to due to disability or end-stage renal disease), you enter an Initial Coverage Election Period. This period runs for seven months: the month you turn 65 (or become may be able to access), plus three months before and three months after. During this window, you can choose Original Medicare, enroll in a Medicare Advantage plan, add Part D prescription drug coverage, or purchase a Medigap plan without waiting periods or medical underwriting in most states.
This is a one-time window. Once it closes, you cannot go back and change your choices unless you have a may have access to life event. If you miss this period and do not enroll in Part D, for example, you will owe a late enrollment penalty for every month you go without coverage, even if you join a plan years later. The penalty is permanent and added to your Part D premium for life.
What Happens If You Miss the Enrollment Period
If you do not change your plan during the Annual Enrollment Period and you do not have a may have access to life event, you are locked into your current plan for the entire next year. You cannot switch to a different plan, add coverage you do not have, or make any changes until the next Annual Enrollment Period arrives. This applies even if you discover your current plan no longer covers your doctor, your medications cost more than you expected, or you move to a different state.
The one exception is if your plan is being discontinued or merged with another plan. Medicare will notify you in writing if this happens, and you will be given a Special Enrollment Period to choose a new plan. You will also have a Special Enrollment Period if your plan significantly reduces its service area (for example, if a Medicare Advantage plan stops serving your county).
If you go without Part D prescription drug coverage for 63 or more days in a row, you will owe a late enrollment penalty when you eventually join a plan. This penalty is calculated based on how long you were without coverage and is added to your Part D premium permanently. Even if you rejoin during a later Annual Enrollment Period, the penalty stays with you.
How to Make Changes During an Enrollment Period
To change your Medicare plan, you have three main options: go online at Medicare.gov, call Medicare at 1-800-MEDICARE (1-800-633-4227), or work with a licensed insurance agent or broker who represents Medicare plans. The Medicare.gov website has a plan comparison tool where you can enter your current medications, doctors, and hospitals to see which plans cover them and what your costs would be. You can enroll directly through the website during the Annual Enrollment Period.
If you call Medicare, a representative will walk you through your options and can enroll you over the phone. This is useful if you have questions about specific plans or need help understanding your choices. The call is free and available seven days a week during the Annual Enrollment Period.
Insurance agents and brokers can also help you compare plans and enroll. They work on commission from the plans, but the cost to you is the same whether you enroll directly or through an agent. Some people find this helpful if they want personalized guidance, though you should verify that any agent you work with is licensed and not trying to pressure you into a plan that does not fit your needs.
Important Dates and important date to Remember
| Event | Dates | What You Can Do |
|---|---|---|
| Annual Enrollment Period | October 15 – December 7 | Switch any Medicare plan, add or change Part D, change Medigap |
| Changes take effect | January 1 | Your new plan begins; old plan ends December 31 |
| Initial Coverage Election Period | 3 months before – 3 months after you turn 65 (or become may be able to access) | Choose Original Medicare, Medicare Advantage, Part D, or Medigap for the first time |
| Special Enrollment Period | Usually 60 days from may have access to event | Change plans if you have a may have access to life event |
Frequently Asked Questions
Can I change my Medicare plan more than once during the Annual Enrollment Period?
Yes. You can make multiple changes during the Annual Enrollment Period, and only your final choice will take effect on January 1. However, if you enroll in a plan, then change your mind and enroll in a different plan before December 7, only the second enrollment counts. This can be useful if you want to compare plans, but avoid enrolling and unenrolling repeatedly, as it can create confusion with your coverage.
What if I move to a different state after the Annual Enrollment Period ends?
Moving to a new state is a may have access to life event that gives you a Special Enrollment Period to change plans. You typically have 60 days from the date you move to switch to a plan that covers your new location. Contact Medicare as soon as you move so they can confirm your new address and help you find plans available in your new state.
Do I have to change my plan every year?
No. If you are satisfied with your current plan, you do not have to make any changes. Your plan will continue into the next year unless it is discontinued or you choose to switch during the Annual Enrollment Period. However, it is a good idea to review your plan each year during the Annual Enrollment Period to make sure it still covers your doctors and medications at costs you can afford.
What happens if I enroll in a plan but do not receive my new Medicare card before January 1?
Contact your new plan directly to confirm your enrollment and ask for a temporary member ID number you can use until your card arrives. You can also call Medicare at 1-800-MEDICARE to verify your enrollment. Do not wait to use your new plan — you are covered as of January 1 even if your card has not arrived yet.
Can I switch back to my old plan if I do not like my new plan after January 1?
Not unless you have a may have access to life event or the next Annual Enrollment Period arrives. Once your new plan takes effect on January 1, you are locked in for the full year. This is why it is important to carefully review your plan choices before the December 7 important date and make sure your doctors and medications are covered.