Where to Find Your Medicare Number and What It Looks Like

Your Medicare number is on your Medicare card, in your Social Security statement, or through your online Medicare account

Your Medicare number is a unique identifier that Medicare uses to track your coverage and claims. It appears on your physical Medicare card in the mail, and you can also find it by logging into your Medicare account online or by calling Medicare directly. If you have not received a card yet, you can request one through your account or by phone.

The fastest way is usually to check your mailbox — Medicare sends cards automatically when you first become covered. If your card is lost or damaged, you can get a replacement without waiting for a new enrollment period. The number itself does not change unless you request a new card for security reasons.

Key Takeaways

Your Medicare number appears on the front of your Medicare card and is also listed in your online Medicare account under your personal information.
If you have not received a card in the mail, you can create a Medicare.gov account to view your number when ready without calling.
You can request a replacement card by phone at 1-800-MEDICARE (1-800-633-4227) or through your online account if your card is lost or damaged.
Your Medicare number is different from your Social Security number, though it may have been based on it in the past — newer cards use a different format.

Check your physical Medicare card first

If you have received your Medicare card, your number is printed on the front in large text. The card is typically red, white, and blue. Look for an 11-character code that includes both numbers and letters — this is your Medicare number. The card also shows your name, the date your coverage began, and which parts of Medicare you have (Part A, Part B, Part D).

Keep your card in a safe place, but you do not need to carry it with you at all times. You can take a photo of it or write down the number for your records. If the card is worn, faded, or damaged, you can order a replacement.

Create a Medicare.gov account to view your number online

If you do not have your card handy or have not received one yet, you can create a free account at Medicare.gov. Go to the Medicare.gov homepage and select "Sign In" in the upper right corner. You will be asked to create a username and password, or you can sign in using your Social Security number and other identifying information.

Once you are logged in, your Medicare number appears under "Personal Information" or "My Health Information." You can view it, print it, or take a screenshot. This account also shows your coverage details, claims history, and any messages from Medicare. Creating an account takes about 10 minutes and requires your Social Security number, date of birth, and email address.

Call Medicare directly at 1-800-MEDICARE

If you prefer to speak with someone, call 1-800-MEDICARE (1-800-633-4227). Representatives are available Monday through Friday, 8 a.m. to 8 p.m. Eastern time. Have your Social Security number and date of birth ready. The representative will verify your identity and read your Medicare number to you over the phone.

Wait times can be long during peak hours, especially early in the week. If you call outside business hours, you can leave a message and a representative will call you back, though this may take a day or two. The phone line also has automated options if you need other information about your coverage.

Request a replacement card if yours is lost or damaged

You can order a new Medicare card through your online account or by calling 1-800-MEDICARE. If you use your account, go to "Personal Information" and select "Order a Replacement Card." You will be asked to confirm your address. The new card typically arrives in 7 to 10 business days.

If you call, a representative will confirm your address and process the request on the phone. You do not need to wait for an enrollment period to get a replacement — Medicare sends new cards year-round. There is no cost for a replacement card.

Understand the format of your Medicare number

Medicare numbers issued before 2020 were based on your Social Security number and included letters. Newer cards use a different format called a Medicare Beneficiary Identifier (MBI), which is random and does not contain your Social Security number. If you received your card before 2020, it may still show a number based on your Social Security number, but you can request a new card with the updated format.

The MBI format is three letters, two numbers, one letter, two numbers, one letter, and one number — for example, ABC12D34E5. This change was made to protect your Social Security number from being exposed if your Medicare card is lost or stolen. Both old and new numbers are valid for Medicare purposes, but the newer format is more find.

What to do if you never received a Medicare card

If you became may be able to access for Medicare but have not received a card after 30 days, check your online Medicare account first — your number is there even if the physical card has not arrived. Then call 1-800-MEDICARE to confirm your address is correct in the system. If the address is wrong, update it and request a new card.

In rare cases, mail can be delayed or lost. If you need your number before the card arrives, use your online account or call Medicare. You do not have to wait for the physical card to use your Medicare coverage — your number is active as soon as your coverage begins.

Frequently Asked Questions

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

Not necessarily. Older Medicare cards used your Social Security number as the basis for your Medicare number, but new cards issued since 2020 use a random Medicare Beneficiary Identifier instead. If you have an older card, you can request a new one with the updated format.

Can I change my Medicare number?

You cannot change your Medicare number itself, but you can request a new card with a different number if you have security concerns. Call 1-800-MEDICARE or use your online account to request a replacement. The new number will be active once the card arrives.

What if I lost my Medicare card and need my number right away?

Log into your Medicare.gov account and view your number under Personal Information — this takes a few minutes and does not require a phone call. If you do not have an account, you can create one in about 10 minutes using your Social Security number and date of birth.

Do I need to memorize my Medicare number?

You do not need to memorize it, but it is helpful to write it down or take a photo of your card for your records. You will need it when you see a doctor, fill a prescription, or contact Medicare about your coverage or claims.

What if my name changed after I got my Medicare card?

Your Medicare number stays the same even if your name changes. Update your name in your Medicare account or call 1-800-MEDICARE to notify Medicare of the change. You can request a new card with your updated name at the same time.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.