How to read your Medicare card
The red, white, and blue Medicare card has six pieces of information that drive every decision in the rest of the Medicare system. Here's what each one means and what to do if something looks off.
The fields, one by one
Name
Should match your Social Security record exactly. If yours has a typo or you've changed your name, fix it through the Social Security Administration first — Medicare pulls from SSA's database. Call SSA at 1-800-772-1213.
Medicare Number (MBI)
Your Medicare Beneficiary Identifier — eleven characters, mixed letters and numbers, formatted as 1AB2-CD3-EF45. Replaced the old SSN-based HICN format starting in 2018. It's your unique Medicare ID; you give it to providers and pharmacies for billing.
Don't confuse it with your SSN. Modern MBIs deliberately don't encode your Social Security number. If your card still shows your SSN, request a replacement at medicare.gov — there's no charge.
Entitled to: Hospital (Part A)
Medicare Part A covers inpatient hospital, skilled nursing, hospice, and some home health. Most people get Part A premium-free at 65 because they (or a spouse) paid Medicare taxes for 40+ quarters.
The date next to it is when your Part A coverage started. If you signed up at 65, this is the first of your birthday month (or the month before, if your birthday is on the 1st).
Entitled to: Medical (Part B)
Medicare Part B covers doctors, outpatient, preventive care, durable medical equipment, and ambulance. Unlike Part A, Part B has a monthly premium ($206.50 in 2026 for most enrollees).
If this date is missing, you delayed enrolling in Part B. That's fine if you have creditable employer coverage from an active job — but COBRA, retiree plans, and VA coverage do NOT count as creditable. See COBRA + Medicare if that applies to you.
Sex
Pulled from your SSA record. Update through SSA if it's wrong — Medicare doesn't process this change directly. Note: Medicare rules treat coverage identically regardless of sex; this field is purely identification.
Sign here
Sign in ink on the back. The signature isn't used for verification at point of care, but a signed card is harder for someone else to use if it's lost or stolen. Don't laminate the card — you may need to replace it with a new MBI later, and lamination interferes.
Common questions
I have Medicare Advantage. Why am I getting a separate plan card?
When you join an MA plan, you get a second card from the private carrier (UnitedHealthcare, Humana, Quartz, etc.) with their own ID. Use the carrier's card at the doctor, not the red- white-and-blue Medicare card — providers bill the carrier, not Medicare directly.
What if I lose the card?
Order a free replacement online at medicare.gov (My Medicare account) or by phone at 1-800-MEDICARE. Arrives in 30 days. You can print a temporary card from your online account in the meantime.
Should I carry the card around with me?
Yes for medical appointments. Skip it for everyday wallet- carrying — if your wallet is lost or stolen, you don't want your MBI in it. A photo of the card on your phone (locked) is what most people use.
Why is the card “red, white, and blue”?
Federal program tradition. The MBI format and color scheme are deliberately distinct from any state-issued ID and from carrier-issued plan cards, so providers can tell at a glance whether to bill Medicare or a private insurer.
Watch for Medicare card scams
Medicare will never call you and ask for your MBI to “verify” eligibility, send a new card, or process a refund. Anyone calling unsolicited and requesting it is a scammer. Hang up and report at HHS OIG.
Want to use your card to compare plans?
Snap a photo at the start of the questionnaire — we'll read your Part A/B effective dates and use them to scope which enrollment options apply to you.
Start questionnaire