In 2018 the Centers for Medicare & Medicaid Services (CMS) removed Social Security number-based Health Insurance Claim Numbers (HICNs) from Medicare cards and is now using Medicare Beneficiary Identifiers (MBIs) for certain Medicare transactions, such as billing, eligibility status, and claim status. CMS is currently in a transition period through Dec. 31, during which either HICNs and MBIs can be submitted with claims.
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