The caller says Medicare is issuing new cards, or that your old card is being deactivated, or that there’s been fraud on your account and they need to verify your information. They ask for your Medicare number, date of birth, sometimes your bank routing for the new plan. The script is professional. They have a hold queue and a callback number.
Medicare does not call you and ask for your number. Your number is already on the card they sent you. If they need to reach you, they send a letter.
This one targets older adults specifically, and it works because the consequences of being wrong feel enormous. Losing coverage is scary in a way that losing a streaming account isn’t. The scammer counts on that.