Medicare Q&ASeptember 16, 2026·8 min read·By Jacob Posner, Founder & Editor
Where Is the Medicare Claim Number on Your Card? (2026)
Short answer: Yes, it's printed on the front of your card, right under your name.
Full answer: Yes. Your Medicare Number, the modern replacement for the old Social Security based Claim Number, appears directly on the front of your red, white, and blue Medicare card, printed just below your name. Since April 2018, the Centers for Medicare & Medicaid Services (CMS) replaced the Social Security based Health Insurance Claim Number (HICN) with a randomly generated 11 character Medicare Beneficiary Identifier (MBI) to protect against identity theft. If you cannot find your physical card, you can look up the same number through your secure MyMedicare.gov account, a recent Medicare Summary Notice, or by calling 1-800-MEDICARE.
Millions of Medicare beneficiaries still ask their doctor's office or pharmacy for their claim number, a term that has not technically existed since 2019. Medicare renamed the number that identifies you in its systems, and the replacement, called the Medicare Number or Medicare Beneficiary Identifier (MBI), sits in the same spot on the card that the old claim number used to occupy: directly under your name on the front of the red, white, and blue card.
The sections below walk through exactly where to look on your 2026 Medicare card, what the 11 character MBI format means, how it differs from the Social Security based number Medicare used before April 2018, and what to do if your card is lost, damaged, or you cannot locate the number at all. For related coverage questions, see what happens if I miss Medicare enrollment or check your options with the screener.
Coverage Breakdown
Coverage by type
Card Type
Shows Your Medicare Number (MBI)?
What's Printed on the Card
Who Issues It
Original Medicare card
Yes
Your 11 character Medicare Number, your full name, and the effective dates for Medicare Part A (Hospital) and Medicare Part B (Medical) coverage
Centers for Medicare & Medicaid Services (CMS) and the Social Security Administration
Medicare Advantage (Part C) plan card
Varies
A plan specific Member ID issued by the private insurer; some Medicare Advantage plans also print your Medicare Number, but it is not required
The private insurance company administering your Medicare Advantage plan
Medicare Part D prescription drug plan card
Varies
A separate Member ID, RxBIN, and RxPCN used by pharmacies; your Medicare Number is usually not shown
The private insurer administering your Part D plan
Medigap (Medicare Supplement) card
No
Your Medigap policy number, which is different from your Medicare Number
The private Medigap insurance company
You need your Original Medicare card, not your Medicare Advantage or Medigap card, whenever a provider specifically asks for your Medicare Number (MBI) for billing in 2026.
Yes, the number people still call the Medicare claim number is printed on the front of your red, white, and blue Medicare card, directly below your name. Since April 2018, CMS has called this the Medicare Number, or Medicare Beneficiary Identifier (MBI), an 11 character code that replaced the old Social Security based Health Insurance Claim Number (HICN). If you do not have your card, your MyMedicare.gov account and recent Medicare Summary Notices show the same number.
From Claim Number to Medicare Number: A Short History
Congress ordered the change in the Medicare Access and CHIP Reauthorization Act (MACRA) of 2015, which required CMS to remove Social Security numbers from every Medicare card. Before that law, your Medicare claim number was your Social Security number followed by a one or two letter suffix (like 123-45-6789A), and it appeared on the same red, white, and blue card that doctors, hospitals, and pharmacies still use today. CMS mailed new cards with the replacement Medicare Number to more than 60 million beneficiaries between April 2018 and April 2019.
CMS made the switch because a Social Security based claim number is extremely valuable to identity thieves: anyone who saw an old Medicare card could read the cardholder's Social Security number in plain sight. The Medicare Number (MBI) is randomly generated and carries no personal information, so losing your Medicare card no longer means losing your Social Security number too.
How to Read the 11 Character Medicare Number Format
Your Medicare Number always has exactly 11 characters, formatted in three groups separated by hyphens on the card, for example 1EG4-TE5-MK73. CMS designed the format so the 2nd, 5th, 8th, and 9th characters are always letters, the 1st, 4th, 7th, 10th, and 11th characters are always numbers, and the 3rd and 6th characters can be either. To avoid confusion with numbers, the letters S, L, O, I, B, and Z are never used anywhere in the MBI.
The 11 character format applies to every Medicare beneficiary nationwide in 2026, whether you are newly enrolled or have had Medicare since before the 2018 to 2019 transition. Providers and pharmacies enter this same 11 character number for every Medicare claim, so keeping it legible and unchanged matters more than any other number on the card.
Exactly Where the Number Sits on the Card
Medicare cards are plain paper, not plastic, with no photo and no chip, printed in red and blue lettering on a white background. Medicare's name runs across the top of the card, your name as it appears in Social Security's records comes next, and your Medicare Number is printed directly beneath your name, exactly where the old claim number used to sit.
Below the Medicare Number, the card lists two effective dates side by side: one for Medicare Part A (Hospital) and one for Medicare Part B (Medical), showing when each part of your coverage began. Because the card is paper, many beneficiaries laminate it or store a photocopy in their wallet while keeping the original in a safe place at home.
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Finding Your Medicare Number Without Your Physical Card
Several official sources besides the physical card show your Medicare Number in 2026, which is useful if the card is lost, faded, or simply not on hand when a provider asks:
MyMedicare.gov account: log in and your Medicare Number appears on your official account summary page.
Medicare Summary Notice (MSN): every MSN mailed quarterly lists the same Medicare Number in the top corner.
Social Security benefit verification letter: available online through your My Social Security account, it lists your Medicare Number if you are enrolled.
Explanation of benefits from a Medicare Advantage or Part D plan: some, though not all, print your underlying Medicare Number.
Call 1-800-MEDICARE (1-800-633-4227): a representative can verify your identity and read the number back to you.
Getting a Replacement Card if Yours Is Lost or Damaged
Medicare replacement cards are free and normally do not change your Medicare Number. You can print an official copy immediately from your MyMedicare.gov account, request a mailed replacement through your My Social Security account, or call 1-800-MEDICARE and ask for a new card to be sent to your address on file.
One 2026 exception involves fraud protection: CMS is reissuing roughly 1.3 million Medicare Numbers to beneficiaries whose MBIs were compromised in past data breaches, with the new numbers becoming effective April 14, 2026. If you receive an unexpected new Medicare card in early 2026, it is a legitimate CMS mailing, not a scam, and you should destroy the old card once the new number is active.
Protecting Your Medicare Number From Fraud
Treat your Medicare Number with the same caution you would use for a Social Security number: share it only with your doctor, pharmacist, hospital, insurance plan, or a trusted family member helping with your care. Medicare will never call, text, or email you out of the blue asking you to confirm your Medicare Number in exchange for a free service, device, or genetic test.
Report any suspected Medicare Number fraud to 1-800-MEDICARE or the Department of Health and Human Services Office of Inspector General hotline at 1-800-HHS-TIPS. Catching misuse early can prevent a fraudulent claim from being billed under your Medicare Number, which can otherwise take months to untangle.
Frequently Asked Questions
Is my Medicare claim number the same as my Medicare Number?
Yes, they refer to the same thing today. Medicare used the term claim number for the Social Security based Health Insurance Claim Number (HICN) before April 2018. CMS replaced it with the Medicare Beneficiary Identifier (MBI), officially called your Medicare Number, but many people and even some providers still use the older term out of habit.
What does the Medicare Number (MBI) look like?
Your Medicare Number has 11 characters formatted like 1EG4-TE5-MK73, mixing numbers and letters in a set pattern. The 2nd, 5th, 8th, and 9th characters are always letters, and the letters S, L, O, I, B, and Z never appear, so the number cannot be confused with a zero, a one, or another digit.
Can I still use my old Medicare claim number (HICN)?
No. Since January 1, 2020, Medicare and its contractors reject claims submitted with the old Social Security based Health Insurance Claim Number. Providers must use your current 11 character Medicare Number (MBI) for every transaction, so hold onto your newest Medicare card and destroy any card showing the old format.
Where do I find my Medicare Number if I lost my card?
Log into your MyMedicare.gov account to view or print it immediately, check a recent Medicare Summary Notice, look at your My Social Security benefit verification letter, or call 1-800-MEDICARE and verify your identity over the phone. All four sources show the identical 11 character Medicare Number.
Does my Medicare Advantage card show my Medicare Number?
Usually not directly. Medicare Advantage plans issue their own card with a plan specific Member ID that pharmacies and providers use for that plan's billing. Some insurers also print your underlying Medicare Number for reference, but you should keep your Original Medicare card too, since certain providers and services still require it.
How do I get a replacement Medicare card?
Replacement cards are free in 2026. Print one instantly from your MyMedicare.gov account, request a mailed copy through your My Social Security account, or call 1-800-MEDICARE (1-800-633-4227). Your Medicare Number normally stays the same on a replacement card unless CMS specifically notifies you of a reissue.
Why is CMS reissuing some Medicare Numbers in 2026?
CMS is reissuing about 1.3 million Medicare Numbers to beneficiaries affected by past data breaches, with the new numbers taking effect April 14, 2026. If you receive an unrequested new card in early 2026, it is a legitimate fraud protection mailing, and you should start using the new number and destroy the old card.
Is it safe to carry my Medicare card in my wallet?
Providers generally need to see your Medicare card at appointments, so most beneficiaries do carry it, but treat it like a Social Security card. Consider carrying a photocopy with the last few digits blacked out for everyday errands, and keep the original at home, reserving it for medical visits where verification is required.
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3. CMS: Medicare Beneficiary Identifier (MBI) Overview — CMS overview of the Medicare Beneficiary Identifier (MBI), the 2018 to 2019 transition, and why the Social Security based claim number was retired.
4. CMS: Understanding the MBI Format — CMS technical reference for the 11 character MBI format, including which characters are letters versus numbers.
