Medicare Card, Number, and ID: Everything You Need to Know

Every Medicare beneficiary receives a red, white, and blue Medicare card from the federal government. This card is your parent's proof of enrollment, their identification number for medical appointments, and the first thing every doctor's office and hospital will ask for when they check in. It's also one of the most targeted pieces of identification for healthcare fraud.

This article covers what the card looks like, what the numbers mean, how to get a replacement if it's lost, and how to protect it from the scammers who actively try to steal Medicare numbers from seniors.

What the Medicare card looks like

The current Medicare card is a paper card (roughly the size of a credit card) with a red, white, and blue design. CMS redesigned the card in 2018-2019 to remove Social Security numbers and replace them with a unique Medicare Beneficiary Identifier (MBI).

The card shows:

• Your parent's name
• Their Medicare number (the MBI — an 11-character alphanumeric code)
• The parts of Medicare they're enrolled in — Part A, Part B, or both
• Coverage start dates — when Part A and Part B coverage began

The Medicare number (MBI) is the most important piece of information on the card. It's what healthcare providers use to bill Medicare, and it's what you'll need when calling Medicare, enrolling in supplemental coverage, or managing your parent's benefits.

Understanding the Medicare number

The MBI replaced the old Health Insurance Claim Number (HICN), which was based on the beneficiary's Social Security number. The new MBI is randomly generated and contains no personal information — it can't be reverse-engineered to find your parent's Social Security number.

The MBI format is 11 characters: a mix of uppercase letters (excluding S, L, O, I, B, Z) and numbers (excluding 0). The format follows a specific pattern — for example, the first character is always a number, the second is always a letter.

Your parent's Medicare number is different from their Social Security number. Never give out their Social Security number when a provider asks for their "Medicare number" — only the MBI on the Medicare card is needed.

What to do with a lost or damaged Medicare card

If your parent's Medicare card is lost, stolen, or damaged, getting a replacement is straightforward.

Online (fastest method)

1. Log in to your parent's account at Medicare.gov (or create one if they don't have it)
2. Navigate to "Get your Medicare card" or "Replacement card"
3. Follow the prompts — the card can be printed immediately or a new physical card can be mailed

Alternatively, you can log in to the my Social Security account at ssa.gov and request a replacement card there.

By phone

Call 1-800-MEDICARE (1-800-633-4227), available 24 hours a day, 7 days a week. TTY users can call 1-877-486-2048. A representative can verify your parent's identity and send a replacement card.

If you're calling on your parent's behalf, you may need to have your parent present on the call or have authorized representative documentation on file.

In person

Visit the local Social Security office with your parent (or with proper authorization documentation). They'll issue a replacement.

Timeline

A replacement card typically arrives within 30 days by mail. If your parent has a medical appointment before the card arrives, their doctors can look up the Medicare number using their name, date of birth, and Social Security number. The Medicare number itself doesn't change when a replacement card is issued — it's the same MBI on a new piece of cardboard.

Finding the Medicare number without the card

If your parent needs their Medicare number right now and can't find the card:

• MyMedicare.gov account — the number is displayed in the account dashboard
• My Social Security account (ssa.gov) — shows Medicare information
• 1-800-MEDICARE — a representative can look it up after identity verification
• Medicare Summary Notices (MSN) — the quarterly statements Medicare mails to beneficiaries include the Medicare number
• Explanation of Benefits (EOB) — from any Medicare claim
• Their Medigap or Medicare Advantage insurer — the supplemental plan has the Medicare number on file

Keep a record of your parent's Medicare number in a secure location separate from the physical card. If they lose the card, having the number means they can still receive care without delay.

Protecting the Medicare card from fraud

Medicare fraud is a significant problem, and your parent's Medicare number is valuable to scammers. Here's what families need to know:

Never share the Medicare number with unsolicited callers

Medicare will never call your parent and ask for their Medicare number. If someone calls claiming to be from Medicare and asks for the number, it's a scam. Period. Medicare already has the number — they don't need to ask for it.

Common scam approaches:

• "We need to verify your Medicare number for your new card"
• "Your Medicare benefits are about to expire — give us your number to keep them active"
• "You qualify for a free back brace/DNA test/medical device — we just need your Medicare number"

Don't carry the card everywhere

Your parent should bring their Medicare card to medical appointments but not carry it in their wallet for everyday errands. If the wallet is lost or stolen, the Medicare number is exposed. Keep it in a safe place at home and only take it out when needed for healthcare visits.

Monitor Medicare Summary Notices

Medicare mails quarterly statements (MSNs) that list every service billed to your parent's Medicare number. Review these for charges your parent doesn't recognize — unfamiliar doctor names, medical equipment they didn't receive, or services at facilities they never visited. Fraudulent billing often goes undetected because families don't read these notices.

If you find suspicious charges, call 1-800-MEDICARE to report them. You can also report suspected fraud to the HHS Office of Inspector General at 1-800-HHS-TIPS.

What to do if the Medicare number is stolen

If your parent gave their Medicare number to a scammer or suspects it's been compromised:

1. Call 1-800-MEDICARE to report the issue and request monitoring on the account
2. Contact the Senior Medicare Patrol (SMP) in your state for assistance
3. Consider placing a fraud alert on their credit reports if other personal information was also exposed
4. Review recent Medicare Summary Notices for any fraudulent claims
5. Request a new Medicare number if there's evidence of ongoing misuse — CMS can issue a new MBI in cases of identity theft

Medicare card vs. other insurance cards

Your parent may carry multiple insurance cards depending on their coverage:

• The red, white, and blue Medicare card — for Original Medicare (Parts A and B)
• Medicare Advantage plan card — if enrolled in a private Medicare Advantage plan, they'll also receive a card from the insurance company. For most appointments, the Advantage plan card is what they present (not the original Medicare card)
• Medigap plan card — if they have a Medicare Supplement policy, they'll receive a card from that insurer. They present both the Medicare card and the Medigap card at appointments
• Part D prescription drug plan card — for picking up prescriptions at the pharmacy

If your parent has Original Medicare + Medigap + Part D, they may need to carry three cards to medical appointments. Keeping a photo of each card on their phone (and yours) provides a backup if any card is left at home.

Keeping track of it all

Between the Medicare card, supplemental insurance cards, prescription drug plan cards, and the various account logins for Medicare.gov and insurance company portals, there's a lot to manage — especially when you're doing it for a parent from a distance.

Our Medicare Enrollment Guide includes a Medicare card and account information organizer, a fraud detection checklist, and a secure information storage system designed for families managing a parent's Medicare documentation. It's one less thing to keep track of in your head.