Illinois Medicaid - HFS provider contacts
Provider-facing contacts for Illinois Medicaid - HFS: provider services, prior authorization, claims, eligibility and claims portals, credentialing. Every value comes from a public Illinois Medicaid - HFS page or manual, linked next to it, and is rechecked against that source on a schedule.
Last verified Nov 4, 2026
We aggregate public payer sources. Verify with the payer. Numbers can differ by plan, state and line of business.
Provider services
- Provider Billing Hotline / Claims ProcessingMedicaidphone1-877-782-5565
- Claims Processing (alternate)Medicaidphone1-800-226-0768
- Provider Eligibility Inquiry HotlineMedicaidphone1-800-842-1461
Prior authorization
- Drug Prior Approval for ProvidersMedicaidphone1-800-252-8942
- Prior Approval for Medical Equipment, Home Health Services, TherapiesMedicaidaddressP.O. Box 19124, Springfield, Illinois 62794-9124Chapter 100 General Handbook, issued September 2017; fax 217-524-0099
Claims
- Bureau of Professional and Ancillary Services (physicians and practitioners)MedicaidaddressP.O. Box 19115, Springfield, Illinois 62794-9115Chapter 100 General Handbook, issued September 2017; fax 217-524-7120. Claim-type-specific boxes are listed in each provider-type handbook
- Bureau of Hospital and Provider Services (inpatient, outpatient, ASTC, hospice)MedicaidaddressP.O. Box 19128, Springfield, Illinois 62794-9128Chapter 100 General Handbook, issued September 2017; fax 217-524-4283
Eligibility and claims portals
- MEDI (Medical Electronic Data Interchange) / IEC systemMedicaidtextMEDIChapter 100 General Handbook, issued September 2017; HFS web system for eligibility, claim status, 837 upload and 835 download; REV vendors also act as clearinghouses
Credentialing
- IMPACT Provider EnrollmentMedicaidphone1-877-782-5565, option 1
- IMPACT login support emailMedicaidemailIMPACT.Login@illinois.gov
- Provider Enrollment ServicesMedicaidaddressP.O. Box 19114, Springfield, Illinois 62794-9114Chapter 100 General Handbook, issued September 2017
Get alerts when Illinois Medicaid - HFS changes a policy
Prior auth lists, billing rules and coverage changes from Illinois Medicaid - HFS, summarized and sent by email: daily or weekly, your choice, on every plan.