The Centers for Medicare & Medicaid Services (CMS) is required to remove Social Security Numbers (SSNs) from all Medicare cards by April 2019. A new, unique Medicare Number will replace the SSN-based Health Insurance Claim Number (HICN) on each new Medicare card. Starting April 2018, CMS will begin mailing new Medicare cards to all people with Medicare on a flow basis by geographic location and other factors. Wisconsin does not have a scheduled date yet other than we will receive our cards after June 2018.