MedicaidAdministrativeHigh impact
Final Phase-Out of Fee-for-Service Paper Claims and Attachments
Illinois Medicaid - HFS·IL·Provider Notice
Effective date
Dec 15, 2021
We identified it
Jun 20, 2026
Summary
Illinois Medicaid will no longer accept paper claims effective December 15, 2021. All fee-for-service claims must be submitted electronically through the MEDI system or X12 standards, with required attachments uploaded to the Attachment Upload Portal or MEDI system.
Action Required
By December 15, 2021: Billing team must transition all Illinois Medicaid claims to electronic submission through MEDI system or X12 837 standards. Set up access to Attachment Upload Portal at https://claims.hfs.illinois.gov/iec/AttachmentUpload.doit?action=new for required attachments. Use single Attachment Control Number (ACN) per claim in first ACN field of X12 transactions. Upload attachments before claim submission as claims will be immediately rejected if attachments are not found in system.