OA-110: Billing Date Predates Service Date

What Does OA-110 Mean?

When paired with Group Code OA, CARC 110 (Billing Date Predates Service Date) is processed as an adjustment outside the standard CO/PR classifications. This typically occurs in secondary payer or coordination of benefits scenarios. Review the remittance details and the COB arrangement to determine financial responsibility and appropriate next steps.

CARC 110 is used when the payer determines that billing date predates service date. The claim could not be processed as submitted because required information was absent, incomplete, or did not meet the payer's submission standards.

Common scenarios that trigger this adjustment include: the claim was electronically submitted or received by the payer before the date of service listed on the claim, which is a billing integrity violation; A data entry error placed the wrong date of service on the claim, making it appear as though the service has not yet occurred at the time of billing; The date fields in the electronic claim were formatted incorrectly, causing the payer's system to interpret the dates as the billing date predating the service date. The group code paired with CARC 110 determines who bears the financial responsibility — CO places it on the provider as a contractual obligation, PR shifts it to the patient, OA indicates a coordination of benefits or other payer adjustment.

How to Resolve

1. Review the coordination of benefits Examine the OA-110 adjustment to understand how it fits within the primary/secondary payer relationship or other multi-payer context.
2. Verify primary payer adjudication Review the primary payer's EOB to understand the basis for the secondary payer's OA adjustment.
3. Determine the responsible party Based on the COB review, identify whether the adjustment should be absorbed, billed to another payer, or if additional documentation is needed.
4. Appeal or resubmit if needed If the OA adjustment appears incorrect based on the COB arrangement, submit an appeal or corrected claim with the appropriate documentation.
5. Follow up Monitor the claim status and take additional action as needed based on the COB determination.

How to Prevent OA-110

• Maintain accurate coordination of benefits information
• Verify secondary payer requirements before claim submission

Also Filed As

The same CARC 110 may appear with different Group Codes:

Related Denial Codes