MedicaidAdministrativeHigh impact
National Provider Identifier (NPI) Implementation
Illinois Medicaid - HFS·IL·Provider Notice
Effective date
May 23, 2007
We identified it
Jun 21, 2026
Summary
All healthcare providers must obtain and report National Provider Identifiers (NPIs) to Illinois Healthcare & Family Services. Starting May 23, 2007, all claims submissions (electronic, paper, and direct data entry) must include NPIs or they will be rejected, except for UB92 forms.
Action Required
Before May 23, 2007: All providers must obtain NPIs from CMS and report them to Illinois HFS using one of three methods: MEDI/IEC online system (administrators only), paper NPI enrollment packet by calling (217) 782-0538, or web-based application. Billing team must update all claim submission processes to include NPIs instead of legacy provider numbers. Verify NPI information when receiving verification letters from the department. Claims submitted without correct NPIs after May 23, 2007 will be rejected and require resubmission.