Medicare New Card with new ID, part of MACARA Initiative. Medicare will mail new Medicare cards between April 2018 and April 2019. Your new card will have a new Medicare number that’s unique to you, instead of your Social Security number. This will help to protect your identity. The new card won’t change your coverage or benefits. You don’t need to take any action to get your new Medicare card. Medicare will never contact you for your Medicare number or other personal information. Don’t share your Medicare number or other personal information with anyone who contacts you by phone, email, or by approaching you in person.