Five tips to avoid Medicare scams: 
In April OF 2018, Medicare issued new cards to all Medicare recipients. The new cards no longer use Social Security numbers. Instead, members are identified by a unique, eleven-character ID composed of numbers and letters.
The reasoning is sound. The old cards contained social security numbers and getting rid of those numbers should help reduce fraud.  

Medicare card scam tips
(From the Official Medicare site: https://www.medicare.gov/) 

Tip 1: Medicare will never call, email or text you to ask for your personal information. This means that if you receive a communication asking for your information, it’s a scam.

Tip 2: The new cards cost nothing. If you’re asked to pay a fee to expedite or process shipment of your new card, it’s a scam.

Tip 3: Medicare will not contact you via phone, email, or text to discuss your "new benefits" or find out if you’ve received your new card. Medicare benefits are not changing just because new cards are being sent out.

Tip 4: If someone calls, emails, or texts you and claims your Medicare benefits are in danger of being cancelled unless you pay a fee or share your information, it’s a scam.

Tip 5: Medicare does not accept payment in the form of gift cards, wired money, or credit card. If someone asks you to send them money, it's a scam!