CMS handles all requests for changes in Medicare Numbers, including Railroad Retirement
Board beneficiaries. Advise the beneficiary to call Medicare 1-800-MEDICARE (1-800-633-4227)
to request a new Medicare Number. 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 “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.”