Your Medicare number is on your Social Security card or your Medicare card

Your Medicare number is a unique identifier that Medicare uses to track your coverage and medical records. If you have Original Medicare (Part A and Part B), your number is the same as your Social Security number. If you enrolled in Medicare, you received a physical Medicare card in the mail — your number appears on the front of that card, usually in the upper left corner.

You do not need to request a Medicare number separately. It is assigned to you automatically when you turn 65 and become may be able to access for Medicare, or when you first meet the requirements for Medicare coverage due to disability or end-stage renal disease. The Social Security Administration and Centers for Medicare & Medicaid Services (CMS) handle the assignment.

If you have not received your Medicare card yet, or if you have lost it, you can still find your number through other means — and you will need it to set up online accounts, pay premiums, or work with your doctor's office.

Key Takeaways

  • Your Medicare number is printed on your Medicare card, which arrives by mail when you first become may be able to access for Medicare.
  • If you have Original Medicare, your Medicare number is the same as your Social Security number.
  • You can view your Medicare number online by creating an account on Medicare.gov using your email address and password.
  • Your doctor's office, hospital, and insurance company will ask for your Medicare number at every visit and appointment.
  • If your card is lost or damaged, you can request a replacement through Medicare.gov or by calling 1-800-MEDICARE.

Where to find your Medicare number if you have your card

Look at the front of your Medicare card. Your Medicare number appears in the upper left corner, printed in dark text. The number is 11 digits long (or 10 digits plus a letter at the end, depending on when you enrolled). Below the number, you will see your name and the dates your coverage began.

Keep your Medicare card with you at medical appointments, in your wallet, or in a safe place at home. You will need to show it or provide the number to doctors, hospitals, pharmacies, and your insurance company. Many offices now ask for it over the phone or through online patient portals before your visit.

How to find your Medicare number online

You can view your Medicare number without your physical card by logging into your account on Medicare.gov. Go to the Medicare.gov homepage and select "Log In" in the upper right corner. If you do not have an account yet, select "Create an Account" and follow the steps to set one up using your email address.

Once you are logged in, your Medicare number will appear on your account dashboard or under a section labeled "Medicare Coverage" or "My Medicare." You can also read or print a copy of your Medicare card from this page if you need it for an appointment.

If you have trouble logging in or creating an account, you can call 1-800-MEDICARE (1-800-633-4227). Representatives are available Monday through Friday, 8 a.m. to 8 p.m. Eastern time. They can confirm your number over the phone and answer questions about your coverage.

What to do if you have lost or damaged your Medicare card

Request a replacement card through Medicare.gov by logging into your account, finding the card section, and selecting the option to order a new card. The replacement card will be mailed to the address on file with Medicare, usually within 7 to 10 business days.

You do not have to wait for the new card to arrive to use your Medicare number. Write down your number from your online account or ask for it over the phone, and provide it to your doctor or pharmacy right away. Your coverage does not stop because your card is lost — only your physical card is replaced.

If your card was damaged by water, fire, or wear, you can also request a replacement by calling 1-800-MEDICARE. Have your Social Security number ready when you call.

Why doctors and hospitals ask for your Medicare number

Your Medicare number is how your medical providers link your visits, test results, and prescriptions to your Medicare account. When you check in at a doctor's office or hospital, staff will ask for your number so they can verify your coverage and make sure Medicare will pay for your care. They also use it to send bills to Medicare and to update your medical records.

Insurance companies and pharmacies use your Medicare number to process claims and refill prescriptions. If you switch doctors or move to a new hospital system, your number stays the same and helps your new providers access your medical history.

Understanding the format of your Medicare number

Your Medicare number format depends on when you enrolled in Medicare. If you enrolled before 2015, your number is your Social Security number followed by a letter (usually A, B, or D). The letter indicates your relationship to the person who worked and paid into Social Security — for example, A means you are the worker, B means you are the spouse, and D means you are a widow or widower.

If you enrolled in 2015 or later, your Medicare number is a random 11-digit number that is not based on your Social Security number. This change was made to protect privacy and reduce identity theft. Regardless of the format, your number works the same way — it is your unique identifier in the Medicare system.

You will see your number printed on your Medicare card, in your online account, and on any bills or statements Medicare sends you. It remains the same throughout your life unless you request a change.

Keeping your Medicare number safe

Your Medicare number is sensitive information, similar to your Social Security number. Do not share it with anyone unless they are a medical provider, insurance company, or government agency you have contacted directly. Scammers sometimes call or email claiming to be from Medicare and ask for your number — Medicare will never contact you first by phone or email asking for personal information.

If you receive a call or email asking for your Medicare number, hang up or delete the message and call 1-800-MEDICARE yourself to report it. You can also report suspected fraud to the Office of Inspector General at 1-800-HHS-TIPS (1-800-447-8477).

Frequently Asked Questions

Is my Medicare number the same as my Social Security number?

If you enrolled in Medicare before 2015, yes — your Medicare number is your Social Security number plus a letter. If you enrolled in 2015 or later, your Medicare number is a separate 11-digit number that is not based on your Social Security number. You can check which format applies to you by looking at your Medicare card.

What if I never received my Medicare card in the mail?

Contact Medicare by calling 1-800-MEDICARE or logging into Medicare.gov to request a replacement card. Have your Social Security number and date of birth ready. The card will be mailed to your address on file within 7 to 10 business days. In the meantime, you can find your number online through your Medicare.gov account.

Can I change my Medicare number?

Your Medicare number does not change under normal circumstances. It stays with you for life. If you believe there is an error in your number or your account, contact Medicare at 1-800-MEDICARE to report it and request a correction.

Do I need my Medicare number to sign up for Part D prescription coverage?

Yes, you will need your Medicare number when you enroll in a Part D plan or when you switch plans during the annual enrollment period. You can find your number on your Medicare card or through your Medicare.gov account.

What should I do if I think someone has stolen my Medicare number?

Call 1-800-MEDICARE right away to report the theft. You can also contact the Office of Inspector General at 1-800-HHS-TIPS to report suspected fraud. Ask Medicare to monitor your account for unusual activity and consider requesting a new Medicare number if fraud has occurred.