Medicare has finished mailing new MBI-based Medicare cards to Medicare beneficiaries who live in Wave 6 states (Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Texas, Utah, Washington, and Wyoming), CMS reports. Now: Card mailing in the last region began in October in Wave 7 states and territories (Kentucky, Louisiana, Michigan, Mississippi, Missouri, Ohio, Puerto Rico, Tennessee, Virgin Islands). “Medicare will replace all current cards and SSN-based numbers by April 2019,” according to a CMS release on the subject.