MedicaidAdministrativeMedium impact
UPDATE: New Sections Published under the Comprehensive Billing Guide for Medicaid Managed Care Services
Illinois Medicaid - HFS·IL·Provider Notice
Effective date
Jan 26, 2022
We identified it
Jun 20, 2026
Summary
Illinois Medicaid MCOs released updated billing guide versions 23 and 23-A with new sections for Professional Services, Ambulatory Surgical Centers, Therapy Providers, and DME. Key updates include new 340B drug billing language, required behavioral health modifiers for school-based services, and corrected HCBS waiver billing information.
Action Required
Immediately: Billing team should download the updated IAMHP Comprehensive Billing Manual versions 23 and 23-A from https://iamhp.net/providers. Review new sections for Professional Services, Ambulatory Surgical Centers, Therapy Providers, and DME if applicable to your practice. Update billing procedures for 340B drugs, add required behavioral health modifiers for school-based services, and correct HCBS waiver Box 33B inputs. Contact IAMHP with questions about the billing guide or Bureau of Managed Care at 217-524-7478.