Traditional MedicareAdministrativeHigh impact
Health Insurance Claim Number Transition to Medicare Beneficiary Identifier January 1, 2020 Handbook Supplement Update
Illinois Medicaid - HFS·IL·Provider Notice
Effective date
Jan 1, 2020
We identified it
Jun 20, 2026
Summary
Starting January 1, 2020, all Medicare claims must use the new Medicare Beneficiary Identifier (MBI) instead of the old Health Insurance Claim Number (HICN). Claims submitted without a valid MBI will be denied with error code K22.
Action Required
By January 1, 2020: Billing team must update all systems to use Medicare Beneficiary Identifier (MBI) instead of Health Insurance Claim Number (HICN) for all Medicare claims. Update paper billing forms HFS 3797 and UB-04 formats. Ensure institutional claims include MBI in Form Locator 60. Claims without valid MBI will be denied with error code K22.