Is it compliant to use CAS*CO*94 with a negative $ amount when we pay in excess of billed charges. Our provider is indicating that we should be using CAS*CO*94 instead of CAS*OA*94.
n the 005010X221A1, in section 1.10.2.6 on Procedure Code Bundling and Unbundling and in section 1.10.2.13 Secondary Payment Reporting Considerations, the use of the group code OA with the CARC of 94 is explicitly stated. In those cases, the use of CO with 94 would be inappropriate.
In cases other than these two, the guide does allow Claim Adjustment Group Codes of CO and OA with Claim Adjustment Reason Code 94. The specifics of the business dictate which codes would be used. If paying in excess of the submitted charge is because of "a joint payer/payee contractual agreement or a regulatory requirement", then CO would be required.