Medicare registration happens through Social Security, not Medicare directly, and the process depends on whether you are already receiving Social Security benefits

If you are turning 65 or becoming may be able to access due to disability or end-stage renal disease, you will register through Social Security — either online, by phone, or in person at a local office. The timing matters: you can register up to three months before your 65th birthday, and doing so on time protects you from late-enrollment penalties on some coverage types. If you are already collecting Social Security, Medicare enrollment happens automatically three months before your 65th birthday, and you will receive your card in the mail.

The process itself is straightforward, but the options you choose during registration shape your coverage for the year ahead. This guide walks you through where to register, what information to bring, and what happens after you submit your information.

Key Takeaways

  • You can register online through Social Security at ssa.gov, by calling 1-800-772-1213, or by visiting a local Social Security office in person.
  • Register between three months before and three months after your 65th birthday to avoid late-enrollment penalties on Part B and Part D coverage.
  • If you are already receiving Social Security benefits, Medicare enrollment happens automatically and you do not need to take action.
  • You will need your Social Security number, birth certificate, proof of citizenship or legal residency, and information about current health coverage when you register.
  • After you register, your Medicare card arrives in the mail within two to four weeks, and your coverage begins on the first day of the month you turn 65.

Register online through Social Security's website

The fastest way to register is through the Social Security website at ssa.gov. Go to the "Benefits" section and look for the option to explore for Medicare. You will create a my Social Security account if you do not already have one, then answer questions about your personal information, work history, and current coverage. The online form takes about 15 to 20 minutes to complete.

After you submit, Social Security sends you a confirmation number by email. Keep this number — you will need it if you have questions about your process. You do not receive your Medicare card when ready; it arrives by mail within two to four weeks. Your coverage begins on the first day of the month you turn 65, regardless of when your card arrives.

Call Social Security to register by phone

If you prefer to speak with someone, call Social Security at 1-800-772-1213. The line is open Monday through Friday, 7 a.m. to 7 p.m. your local time. Have your Social Security number, birth certificate information, and details about any current health coverage ready before you call. The representative will walk you through the same questions as the online form and will give you a confirmation number at the end of the call.

Wait times can be long, especially in the weeks before and after your birthday month. If you reach a busy signal, try calling early in the morning or later in the afternoon. You can also call back another day — Social Security keeps your information on file, so you can complete the process over multiple calls if needed.

Visit a Social Security office in person

You can also register at your local Social Security office. Find the nearest one by going to ssa.gov and using the office locator, or call 1-800-772-1213 for the address and hours. Bring your Social Security number, birth certificate, proof of citizenship or legal residency (passport, naturalization certificate, or permanent resident card), and information about any current health coverage you have.

Walk-in hours vary by location. Some offices take walk-ins in the morning, while others require you to get a ticket and wait. Many offices now encourage you to make an appointment ahead of time through their website or by phone. An appointment usually means a shorter wait.

What documents and information you need

Before you register — whether online, by phone, or in person — gather these items:

  • Your Social Security number
  • Your birth certificate or other proof of birth date
  • Proof of citizenship or legal residency (U.S. passport, naturalization certificate, permanent resident card, or visa)
  • Information about any current health coverage (employer coverage, TRICARE, Veterans benefits, or other insurance)
  • Your bank account information if you want your Social Security payments deposited directly (optional, but recommended)

If you do not have a birth certificate, you can use a passport, driver's license, or other government-issued ID. If you are not a U.S. citizen, you will need to show your green card or visa. Social Security will make copies of these documents, so bring originals or certified copies.

Timing: when to register to avoid penalties

Register during your Initial Enrollment Period, which runs for seven months: three months before your 65th birthday, the month you turn 65, and three months after. If you register during this window, your coverage begins on the first day of the month you turn 65 (or the first day of the month you become may be able to access, if that is earlier).

If you miss this window and do not have coverage through an employer or union, you may face a late-enrollment penalty on Part B and Part D that increases your premiums permanently. The penalty is 10 percent of the Part B premium for each 12-month period you were not enrolled, and a similar calculation applies to Part D. For example, if you register two years late, you would pay an extra 20 percent on top of your regular Part B premium for as long as you have Medicare.

There are exceptions: if you have coverage through a current employer or union, or through TRICARE or the Veterans Administration, you can register later without penalty. When that coverage ends, you have eight months to enroll in Medicare without penalty.

What happens after you register

After you submit your registration, Social Security processes your information and sends you a confirmation. Your Medicare card arrives by mail within two to four weeks. The card shows your Medicare number, your name, the date your coverage begins, and which parts of Medicare you have (Part A, Part B, Part D, or a combination).

Your coverage begins on the first day of the month you turn 65. If you registered before your birthday, your card may arrive after your coverage has already started — that is normal. You can use your Social Security number as your Medicare number until your card arrives. When you see a doctor or fill a prescription, tell them your Social Security number and they can look up your coverage.

If your card does not arrive within four weeks, call Social Security at 1-800-772-1213 to check on it. If you need to make changes to your coverage — such as adding Part D or switching to a Medicare Advantage plan — you can do that during the Annual Enrollment Period, which runs from October 15 to December 7 each year.

Frequently Asked Questions

Do I have to register if I am already getting Social Security?

No. If you are already receiving Social Security benefits, Medicare enrollment happens automatically three months before your 65th birthday. You will receive your Medicare card in the mail without taking any action. You do not need to call or visit an office unless you want to make changes to your coverage choices.

What if I am still working and have health coverage through my job?

You can delay registering for Part B without penalty as long as you have coverage through a current employer or union. When that coverage ends, you have eight months to enroll in Part B without a late-enrollment penalty. You should still register for Part A (hospital insurance) at 65, even if you delay Part B. Register through Social Security using the same process described above.

Can I register before I turn 65?

Yes. You can register up to three months before your 65th birthday. This is the best time to register because it gives Social Security time to process your process and send your card before your coverage begins. If you wait until after your birthday, your coverage may start before your card arrives, but you can still use your Social Security number to access care.

What if I miss the registration important date?

If you miss your Initial Enrollment Period and do not have an exception (such as employer coverage or TRICARE), you can still register, but you may face a late-enrollment penalty on Part B and Part D. The penalty increases your premiums permanently. You can register at any time by contacting Social Security, but registering sooner rather than later limits how much the penalty grows.

How do I know if my registration went through?

Social Security gives you a confirmation number when you register online, by phone, or in person. Write this number down. You can also check the status of your process by logging into your my Social Security account at ssa.gov, or by calling 1-800-772-1213. Your Medicare card in the mail is the final confirmation that your registration was successful.