MedicaidAdministrativeMedium impact
National Provider Identifier (NPI) Implementation Contingency Plan
Illinois Medicaid - HFS·IL·Provider Notice
Effective date
May 23, 2007
We identified it
Jun 21, 2026
Summary
Illinois Medicaid (HFS) has implemented a contingency plan allowing providers to continue submitting claims with legacy provider numbers instead of requiring NPIs immediately. The system will accept NPI-only, legacy-only, or both identifiers together, with crosswalk attempts to process claims.
Action Required
Immediately: Obtain NPI if not already done at https://nppes.cms.hhs.gov/. Report NPI information to HFS at www.myhfs.illinois.gov or www.illinoisnpi.com. Update billing system to include NPI for Billing Provider field on all claim types. For providers without internet access, contact Provider Participation Unit at 217-782-0538 for paper enrollment. Continue using HFS legacy provider numbers for eligibility inquiries (270/271), claim status (276/277), and prior approval (278) transactions until further notice.