Group Codes
CO = Contractual Obligations
CR = Corrections and Reversal
OA = Other Adjustments
PI = Payer Initiated Reductions
PR = Patient Responsibility

Note: The Group, Reason and Remark Codes are HIPAA EOB codes and are cross-walked to L&I's EOB codes. HIPAA EOB codes are returned on the 835 Remittance Advice file and are maintained by the Washington Publishing Company. For additional information on HIPAA EOB codes, visit the Code List section of the WPC website at

Printable version of all current EOB codes

Review the explanation associated with your processed bill. The three digit EOB on your remittance advice explains how L&I processed a bill, and how to make corrections if needed.