What is the contact number for cms? Call 1-800-MEDICARE (1-800-633-4227) TTY users should call. 1-877-486-2048 You can also get information on your most recent claims without having to speak to a customer service representative. Please be sure you have your Medicare number available before calling.What is the telephone number for cms? The customer support phone number of CMS is +1-410-786-3000 (Click phone number to call). The postal and official address, email address and phone number (helpline) of CMS Service Center and CMS customer service phone number is given below.What is medicare cms number? Phone Number of Maryland Medicare is 1-800-633-4227, 1-877-486-2048 (TTY) . Maryland Medicare is a social insurance program based in the U.S. state of Maryland which serves under the Centers for Medicare and Medicaid Services or CMS.What is a cms call center? Call Center. Inquiries related to the physician self-referral law, the CMS Voluntary Self-Referral Disclosure Protocol, or the procedure for submitting requests for advisory opinions may be e-mailed to the CMS Physician Self-Referral Call Center at [email protected] .