You can file for Medicare starting three months before the month you turn 65

Medicare enrollment opens in the three-month window before your 65th birthday month. If you turn 65 in June, you can file starting in March. The enrollment period runs from the first day of that three-month window through the end of the month you turn 65. If you miss this window, you can still file later, but you may face a permanent penalty on your premiums.

You do not have to wait until your actual birthday to file — you can submit your process as soon as the window opens. Most people file online through Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office. Processing typically takes a few weeks, so filing early gives Medicare time to process your enrollment before coverage begins.

Key Takeaways

  • You can file for Medicare three months before the month you turn 65, and you should file during this window to avoid late penalties.
  • If you are already receiving Social Security benefits, Medicare enrollment happens automatically at 65 unless you opt out.
  • If you are still working and have employer health coverage, you may be able to delay Medicare without penalty under certain conditions.
  • Missing your initial enrollment period can result in a permanent 10 percent increase to your Part B premium for each year you delay.
  • You can file online at Medicare.gov, by phone, or at your local Social Security office.

Automatic enrollment if you receive Social Security

If you are already collecting Social Security retirement, spousal, or survivor benefits when you turn 65, Medicare enrollment happens automatically. You do not need to file anything — Social Security sends your information to Medicare, and your coverage begins on the first day of the month you turn 65. You will receive your Medicare card in the mail about two weeks before your coverage starts.

Even though enrollment is automatic, you still need to choose which Medicare plans you want. Original Medicare (Part A and Part B) is automatic, but you can switch to a Medicare Advantage plan or add prescription drug coverage (Part D) during your initial enrollment period. If you do not make these choices during the enrollment window, you will be enrolled in Original Medicare by default.

When you are still working with employer coverage

If you are still employed and covered by your employer's health plan, you may be able to delay Medicare Part B without facing a late penalty. This is called the Special Enrollment Period for people with group health plan coverage. You must have creditable coverage — meaning your employer plan covers at least as much as Medicare Part B — and you must be actively working.

When you leave your job or lose your employer coverage, you have eight months to file for Medicare Part B without penalty. This eight-month window starts the month after your employment or coverage ends. You will still need to file for Part A at 65 even if you delay Part B, because Part A is usually free and has no penalty for late enrollment if you have creditable coverage.

If you are self-employed or own a business, you do not may have access to for this exception. You should file for Medicare at 65 even if you are still working, or you may face a permanent premium increase.

Late enrollment penalties and how they work

If you miss your initial enrollment period and do not have a may have access to reason for the delay, you will pay a permanent penalty on your Part B premium. The penalty is 10 percent of the standard Part B premium amount for each full year you were may be able to access but not enrolled. If you delay for two years, you pay 20 percent more for the rest of your life on Medicare.

Part D (prescription drug coverage) has a similar penalty structure. If you go 63 or more days without creditable drug coverage, you pay a penalty equal to 1 percent of the national average Part D premium for each month you were without coverage. Like the Part B penalty, this penalty is permanent.

Part A does not usually carry a late enrollment penalty if you have creditable coverage through an employer or spouse's employer. However, if you do not have creditable coverage and delay Part A past 65, you will pay a 10 percent premium increase.

Special situations that extend your enrollment window

Certain life events give you additional time to file for Medicare outside the standard enrollment periods. If you lose employer coverage due to job loss, retirement, or a reduction in hours, you have eight months from the date coverage ends. If your employer coverage ends because your employer stops offering it, you have the same eight-month window.

If you are a U.S. citizen or permanent resident living outside the United States, you can delay Medicare Part B without penalty as long as you are outside the country. When you return to the U.S., you have eight months to file. If you are a federal employee, you may have different enrollment rules — contact your agency's benefits office.

If you miss your enrollment window for reasons beyond your control — such as a serious illness, a natural disaster, or an error by Social Security or Medicare — you can request a Special Enrollment Period by contacting Medicare directly. These requests are reviewed case by case, and approval is not may provide.

How to file: Online, by phone, or in person

The fastest way to file is online at Medicare.gov. You will need your Social Security number, date of birth, and information about any current health coverage. The online process takes about 10 minutes, and you can save your progress and return later if needed. You will receive a confirmation number when ready.

You can also file by phone at 1-800-MEDICARE (1-800-633-4227). Representatives are available Monday through Friday, 8 a.m. to 8 p.m. Eastern time, and Saturday 9 a.m. to 1 p.m. Eastern time. Have your Social Security number and current insurance information ready when you call.

To file in person, visit your local Social Security office. You can find the nearest office at ssa.gov/locator. Bring your Social Security card, proof of citizenship or legal residency, and information about any current coverage. Processing in person takes longer than online or phone filing, so plan ahead if you choose this route.

What happens after you file

After you submit your process, Medicare processes it and sends you a confirmation letter. This letter includes your Medicare number, which you will use for all future claims and communications. Your Medicare card arrives separately, usually two to three weeks after your coverage begins.

Your coverage typically begins on the first day of the month you turn 65, regardless of when you file during your enrollment window. If you file after your 65th birthday month, your coverage start date may be delayed by one or two months depending on when you file.

Once you have your Medicare number, you can use it to enroll in supplemental coverage (Medigap), Medicare Advantage plans, or prescription drug plans. These choices have their own enrollment important date, so do not wait — file for Medicare first, then review your plan options.

Frequently Asked Questions

What if I turn 65 in January — when does my enrollment window open?

Your enrollment window opens in October of the previous year. You can file starting October 1 and through January 31. Your coverage will begin January 1 if you file during this window.

Do I have to file for Medicare if I am still working and have health insurance?

You do not have to file when ready, but you should file for Part A at 65 because it is usually free. You can delay Part B if you have creditable employer coverage, but file within eight months of leaving that job to avoid penalties.

Can I change my mind after I file for Medicare?

Yes, you have a limited time to change your plan choices. You can switch between Original Medicare and Medicare Advantage plans during the Annual Enrollment Period (October 15 through December 7 each year). Changes to prescription drug plans must also be made during this window.

What if I am not a U.S. citizen — can I still file for Medicare?

You must be a U.S. citizen or permanent resident and have lived in the U.S. for at least five consecutive years to be may be able to access for Medicare. Permanent residents can file at 65 using the same process as citizens.

Will I owe taxes on my Medicare benefits?

Medicare itself is not taxable income. However, if you have other income, a portion of your Social Security benefits may become taxable. Medicare premiums are deducted from your Social Security check or billed separately, but they do not reduce your taxable income.