tci Medicare Compliance & Reimbursement - 2019 Issue 4

Industry Note: Remember, There Are No ‘Os’ In MBIs

CMS wants to remind practices that the new Medicare Beneficiary Identifiers (MBI) do not contain “Os,” but instead utilize zeros, eliminating any confusion on the matter. Nuts and bolts: Each unique MBI consists of 11 randomly-generated alphanumeric characters. CMS uses the numbers 0-9 and uppercase letters from A-Z in the MBIs, according to MLN Matters SE18006. Important: An exception to this rule is that the letters S, L, O, I, B, and Z are not included. CMS excluded these letters to avoid confusion. The percentage of claims using beneficiaries’ new MBI numbers continues to grow, too. For...

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