Mail Forwarding to End for PO Boxes Formerly Located in Missouri 

To all providers: 

On May 14, 2025, four PO boxes changed from the processing center in St. Louis, MO, to a new location in Chicago, IL. The affected P.O. Boxes included: 

TEFRA Premium Unit
PO Box 001054
St Louis, MO 63150-1054

Third-Party Liability
AR Dept of Human Services
PO Box 001159
St. Louis, MO 63150-1159

Medicaid Drug Rebates
PO Box 505297
St. Louis, MO 63150-5297

AR Medicaid Refunds
PO Box 505616
St. Louis, MO 63150-5616 

As a courtesy, correspondence mailed to the old PO boxes in Missouri has been forwarded to the new facility in Illinois since May; however, the grace period will end on November 30, 2025. After November 30, any correspondence sent to the incorrect PO boxes will be returned to the sender.

To avoid delays, please use the following PO boxes for checks mailed to the TEFRA Premium Unit, Third-Party Liability, Medicaid Drug Rebates, or Arkansas Medicaid Refunds: 

TEFRA Premium Unit
PO Box 7411550
Chicago, IL 60674-1550

Third-Party Liability
AR Dept of Human Services
PO Box, 7411552
Chicago, IL 60674-1552

Medicaid Drug Rebates
PO Box 7411554
Chicago, IL 60674-1554

AR Medicaid Refunds 9292
PO Box 7411556
Chicago, IL 60674-1556 

For additional assistance please contact the Provider Assistance Center
at 1-800-457-4454.