The Medicare Access and Chip Reauthorization Act (MACRA) of 2015 required CMS to remove social security numbers from all Medicare cards and replace them with a Medicare Beneficiary Identifier (MBI). The MBI is 11 characters in length and are made up of only numbers and upper case letters. The MBI doesn’t use any special characters (e.g. #, @, !, $) or the letters S, L, O, I, B, and Z to avoid confusion between some letters and numbers (e.g., between “0” and “O”). So when must providers begin using the MBI on claims submitted to their Medicare Administrative Contractor? Beginning with