When and why you need a new Medicare card

You need a new Medicare card if your current one is lost, stolen, damaged, or if your name has changed due to marriage, divorce, or legal name change. Medicare also issues new cards automatically when your coverage changes — for example, if you switch from Original Medicare to a Medicare Advantage plan, or vice versa. You do not need a new card straightforward because you turned 65 or first became may be able to access; your initial card arrives in the mail before your coverage starts.

The process differs slightly depending on whether you are already enrolled in Medicare or explore for the first time. If you are already covered, getting a replacement card is straightforward. If you are new to Medicare, the card arrives as part of your enrollment, and you do not request it separately.

Key Takeaways

  • You can request a replacement Medicare card online through your Medicare.gov account, by phone at 1-800-MEDICARE, or by mail using Form CMS-11-B.
  • A replacement card typically arrives within 7 to 10 business days if you request it online or by phone, or 2 to 3 weeks if you mail a form.
  • You do not need to provide your Social Security number when you request a card; Medicare uses your Medicare number instead.
  • If your name has changed, you must update your name with Social Security first, then notify Medicare — the card will reflect the corrected name.
  • If your card was stolen, report it to Medicare right away and ask about a temporary card number while you wait for the replacement.

Requesting a card online through Medicare.gov

The fastest way to get a new Medicare card is through your Medicare.gov account. Go to Medicare.gov, click "Sign In" at the top right, and log in with your username and password. If you do not have an account, you can create one using your email address and Medicare number (found on your current card or in any Medicare letter you received).

Once logged in, look for the section labeled "Medicare Card" or "Replacement Card" — the exact wording varies slightly. Select the reason you need a new card from the dropdown menu: lost, stolen, damaged, or name change. Review the address where the card will be mailed. If it is incorrect, update it before submitting. Click submit, and you will see a confirmation message with a reference number. Write this number down in case you need to check the status later.

A card ordered online usually arrives within 7 to 10 business days. You can check the status of your order by logging back into Medicare.gov and looking for "Order Status" or "Track My Card" in the same section where you placed the order.

Requesting a card by phone

Call 1-800-MEDICARE (1-800-633-4227) and tell the representative that you need a replacement Medicare card. Have your Medicare number ready — it is on your current card or in any official Medicare letter. The representative will ask you to confirm your name, date of birth, and mailing address. They will also ask why you need a new card.

The phone line is open Monday through Friday, 8 a.m. to 8 p.m. Eastern time, and Saturday, 9 a.m. to 1 p.m. Eastern time. If English is not your first language, you can request an interpreter at no cost. A card ordered by phone arrives within 7 to 10 business days, the same as online orders.

Requesting a card by mail

If you prefer to mail your request, read Form CMS-11-B from Medicare.gov or call 1-800-MEDICARE to have the form mailed to you. Fill out the form completely, including your Medicare number, name, date of birth, and the reason you need a new card. Sign and date the form, then mail it to the address printed on the form itself — this address changes depending on your state.

Mail requests take longer: expect 2 to 3 weeks for your card to arrive after Medicare receives the form. To speed things up, use certified mail with return receipt so you have proof of delivery. Keep the receipt until your new card arrives.

What to do if your name has changed

If you got married, divorced, or legally changed your name, you must update your name with Social Security before Medicare can issue a card with the correct name. Go to your local Social Security office or call 1-800-772-1213 to update your name. You will need to bring a government-issued photo ID and a document that proves the name change — a marriage certificate, divorce decree, or court order.

After Social Security updates your name, Medicare will be notified automatically within a few weeks. You can then request a new card with your updated name using any of the three methods above. Do not request a Medicare card before updating Social Security, because the card will still show your old name.

If your card was stolen or you suspect fraud

Call 1-800-MEDICARE right away and report the theft. Ask the representative whether Medicare can issue a temporary card number while you wait for your replacement card to arrive. Some situations allow this, though it depends on your specific coverage type and whether fraud has already occurred.

You should also monitor your Medicare statements and any bills from doctors or hospitals to watch for charges you did not authorize. If you see fraudulent charges, report them to Medicare and to your doctor's office or hospital. Keep records of all conversations and dates when you reported the theft.

Common mistakes and what to avoid

Do not provide your Social Security number when you request a Medicare card — Medicare uses your Medicare number instead. If a website or caller asks for your full Social Security number to process a card request, it is not a legitimate Medicare service.

Do not assume your address is correct without checking it. If you have moved recently, update your address before submitting your request. A card sent to an old address will not reach you, and you will have to request another one.

Do not wait to report a lost or stolen card. The sooner you report it, the sooner Medicare can watch for fraud and issue a replacement. If you delay, someone else could use your card number to receive medical services in your name.

Frequently Asked Questions

How long does it take to get a new Medicare card?

Online and phone requests usually arrive within 7 to 10 business days. Mail requests take 2 to 3 weeks after Medicare receives your form. The timeline starts from when Medicare processes your request, not from when you submit it.

Can I use my old card while I wait for the new one?

If your old card is not lost or stolen, yes — you can continue using it until the new one arrives. If your card was stolen, contact Medicare to ask about a temporary card number or temporary authorization while you wait.

What if I never received my original Medicare card?

Treat it as a lost card and request a replacement using one of the three methods above. If you enrolled in Medicare more than a month ago and still have not received your card, call 1-800-MEDICARE to check whether there is a delivery problem with your address.

Do I need to do anything after my new card arrives?

No. Your new card works when ready. If your old card was lost or stolen, you can destroy it once the new one arrives. If you have old cards from previous coverage changes, you can throw those away too — only your current card is valid.

Can someone else request a card on my behalf?

Yes, if you give them permission. They will need your Medicare number and can request the card online, by phone, or by mail. However, the card will still be mailed to your address on file, not to theirs.