CMS handles all requests for changes in Medicare Numbers, including Railroad Retirement
Board beneficiaries. Advise all beneficiaries asking for new Medicare Numbers to call
1-800-MEDICARE (1-800-633-4227) to request a change. TTY users can call 1-877-486-2048.
SSA technicians are to verify that the beneficiary’s mailing address is up-to-date.
Process valid change of address (COA) requests to both the Title II and Title XVI
records, as needed, following normal COA procedures.
In addition, advise the beneficiary that “Medicare will never contact you to request
personal information. Be sure to protect your Medicare Number like your SSN and only
share it with trusted providers.”