Healthcare Error Code
Healthcare Insurance / Medical Billing
Duplicate / Billing Errors
CO-23 | Impact of prior payer adjudication
Industry
Healthcare
Canonical
/healthcare/error-codes/co-23/
Last Updated
Feb 25, 2026
Summary
This code indicates that claim processing was affected by a prior payer’s adjudication.
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What This Code Means
CO-23 is used when a payer considers the outcome of another payer’s adjudication. This reflects coordination of benefits processing. The code does not independently determine coverage. It clarifies that payment decisions account for prior payments or denials. Final reimbursement depends on payer order and rules.
Where Users Usually See This Code
- Remittance advice
- EOB summaries
- Coordination of benefits reports
Why This Code Appears
- Secondary or tertiary payer involvement
- Prior payer adjudication exists
- Coordination rules applied
What Typically Happens Next
- Payment is adjusted accordingly
- Claim processing completes
- Balances are updated
What This Code Is Not
- It is not a denial by itself
- It is not a billing error
- It is not patient responsibility alone
Troubleshooting Checklist
- □ Review coordination of benefits
- □ Confirm payer order
- □ Monitor payment adjustments
Notes And Edge Cases
Different payer hierarchies affect outcomes. Timing of adjudication data exchange can influence results.
Related Codes
8 links
- CO-22 CodeCare may be covered by another payer
- CO-98 CodeCharges already adjudicated
- CO-33 CodeInsufficient documentation
- CO-109 CodeClaim not covered by this payer
- CO-27 CodeCoverage terminated
- CO-29 CodeTime limit expired
- CO-178 CodeClaim did not contain sufficient information
- CO-11 CodeDiagnosis inconsistent with procedure
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