Assisting You With Medicare Replacement Cards Requests Need A New Medicare Card? I haven't received my new Medicare card or need a replacement id cardWhat you should do: Look around your house for any old or unopened mail. Your new Medicare card will come in a plain white envelope from the Department of Health and Human Services. Sign in to MyMedicare.gov to get your number or print your official card. Now that Medicare has finished mailing new cards, your new number will appear in MyMedicare.gov. Call 1-800-MEDICARE 1-(800)-633-4227 TTY users can call 1(877)-486-2048. There may be something that needs to be corrected, like your mailing address... The Good News is you can still use your old card to get health care services until January 1, 2020.