You can file for Medicare three months before you turn 65

You do not have to wait until your 65th birthday to start the process. Medicare enrollment opens three months before the month you turn 65 and closes three months after. If you file during this window — called your Initial Enrollment Period — your coverage can start on the first day of the month you turn 65.

If you miss this window, you can still file later, but you may pay a penalty on your premiums for as long as you have Medicare. The penalty is a percentage of what you did not pay, and it stays with you. Filing on time costs nothing extra.

You have three main ways to file: online through Medicare.gov, by phone with Social Security, or in person at a local Social Security office. Online is fastest — you can finish in about 10 minutes if you have your information ready.

Key Takeaways

  • Your Initial Enrollment Period runs from three months before you turn 65 through three months after, and filing during this window means no lifetime penalty.
  • You can file online at Medicare.gov, by calling Social Security at 1-800-772-1213, or at your local Social Security office — online is usually fastest.
  • Have your Social Security number, birth date, citizenship or immigration status, and current income information ready before you start.
  • If you are still working and have health insurance through your employer, you may be able to delay Part B without penalty — ask your employer's benefits office first.
  • After you file, you will receive your Medicare card in the mail within two weeks, and your coverage begins on the first day of the month you turn 65.

Filing online at Medicare.gov

Go to Medicare.gov and look for the "Sign up for Medicare" button on the homepage. You will need to create a login or sign in with an existing account. The form asks for your Social Security number, date of birth, citizenship status, and current mailing address.

You will also answer questions about your income and whether you have other health insurance. Be honest about income — it affects whether you pay extra for Part B and Part D. The online form takes about 10 minutes and you get a confirmation number when ready.

After you submit, Medicare sends a confirmation email and mails your Medicare card within two weeks. You can check the status of your process by logging back into your Medicare.gov account.

Filing by phone with Social Security

Call Social Security at 1-800-772-1213. Have your Social Security number, date of birth, and current address ready. A representative will ask the same questions as the online form — income, citizenship, other insurance — and will file your Medicare process while you are on the call.

The call usually takes 15 to 20 minutes. You will receive a confirmation number and a timeline for when your card will arrive. Social Security representatives speak English and Spanish, and you can request an interpreter for other languages.

If you are deaf or hard of hearing, call the TTY number at 1-800-325-0778.

Filing in person at a Social Security office

Find your local Social Security office at ssa.gov/locator. You can walk in during business hours or schedule an appointment online — appointments usually have shorter wait times.

Bring your Social Security card, birth certificate or passport, proof of citizenship (like a driver's license or passport), and your current address. A representative will complete the Medicare process with you and give you a receipt on the spot.

Processing takes the same amount of time as phone or online filing — your card arrives within two weeks.

What to do if you are still working

If you are 65 or older and still working, you may have group health insurance through your employer. In this case, you can delay enrolling in Medicare Part B without paying a penalty — but you must enroll in Part A (hospital insurance) when you turn 65.

Before you file, contact your employer's benefits office or human resources department. Ask them whether your health plan qualifies as "creditable coverage" under Medicare rules. If it does, they can give you a letter stating this, which you will need if you enroll in Part B later.

When you do leave your job, you have eight months from the date your coverage ends to enroll in Part B without penalty. After that window closes, the penalty applies for life.

What happens after you file

Medicare processes your process within two weeks. You will receive your Medicare card in the mail with your name, Medicare number, and coverage dates. Your coverage starts on the first day of the month you turn 65, even if your card arrives later.

You will also receive information about Part B and Part D premiums — what you owe each month. Part A (hospital insurance) has no monthly premium for most people. Part B (doctor visits) and Part D (prescription drugs) do have premiums, and the amount depends on your income.

If you enrolled in a Medicare Advantage plan or a Medigap plan, you will receive separate information from that insurance company about your coverage and when it starts.

If you miss your Initial Enrollment Period

You can still file for Medicare after your Initial Enrollment Period ends, but you may owe a penalty. The Part B penalty is 10 percent of the standard premium for each full year you delayed, and it stays on your bill for life. The Part D penalty works the same way.

There are a few exceptions. If you have group health insurance through an employer or your spouse's employer, you can file within eight months of losing that coverage without penalty. If you are a federal employee, you have different rules — contact the Office of Personnel Management.

To file late, use the same three methods: Medicare.gov, Social Security phone line, or your local Social Security office. Tell them when your Initial Enrollment Period ended so they can calculate any penalty correctly.

Frequently Asked Questions

What if I turn 65 in the middle of the month?

Your coverage starts on the first day of the month you turn 65, regardless of the date within that month. If you turn 65 on March 15, your Medicare coverage begins March 1. File during your Initial Enrollment Period (three months before through three months after) to avoid penalties.

Can I file for my spouse at the same time?

No. Each person files their own process using their own Social Security number. Your spouse can file at the same time using a different process, but you cannot file for them. If your spouse is not yet 65, they can file when their Initial Enrollment Period begins.

Do I need to bring anything if I file online?

No documents are required to start an online process at Medicare.gov. Have your Social Security number, date of birth, and current address ready. If you have questions about income or other insurance, you may want to have those documents nearby, but you do not need to upload them to complete the form.

What if I do not have a Social Security number?

You can still file for Medicare. Call Social Security at 1-800-772-1213 or visit your local Social Security office in person. A representative will help you through the process and may ask for additional proof of identity and immigration status. Processing may take longer than the standard two weeks.

Can I change my mind after I file?

Yes. You have until the end of your Initial Enrollment Period to change or cancel your Medicare choices. If you enrolled in a specific plan and want to switch, contact that insurance company or Medicare directly. Changes made after your Initial Enrollment Period ends take effect the following month.