From the US Department of Health and Human Services
Centers for Medicare & Medicaid Services
Your new Medicare card is on the way, so if someone calls and says you need to give them your personal information or money to get the new card, hang up! It’s a scam. Medicare will never call uninvited and ask for personal information or money for you to get your new Medicare Number and card. Learn what to do if you get a suspicious call like this.
If you haven’t gotten your new Medicare card yet, don’t worry. Mailing cards to each group of states takes at least a month, so you might get your card at a different time than friends or neighbors in your area. In the meantime, keep using your current Medicare card until your new one arrives.
Note: If you’ve gotten your new card in the mail already, start using it right away!