Denial code OA-23: Impact of prior payer adjudication
A secondary payer is reporting the effect of what the primary already paid — informational, not a denial.
The impact of prior payer(s) adjudication, including payments and/or adjustments.
What OA-23 actually means
OA-23 appears on secondary remittances and simply accounts for what the primary payer already applied. It normally carries no independent action: the secondary calculated its liability net of the primary’s payment and adjustments. The only thing worth checking is that the primary’s payment posted correctly, because an OA-23 on a claim whose primary payment was never posted will leave the account looking permanently unbalanced.
Why this denial happens
- Normal secondary adjudication after a primary payment.
- The secondary’s allowed amount is lower than what the primary already paid, leaving nothing further due.
- Medicare crossover processing.
How to resolve a OA-23 denial
- Confirm the primary payment posted to the same claim before reconciling.
- Post the secondary’s adjudication and move any remaining balance to the correct party.
- No appeal is warranted unless the secondary miscalculated against the primary remittance.
How to prevent it
- Post primary remittances before secondary claims go out so the balances reconcile cleanly.
Frequently asked
What does denial code OA-23 mean?
A secondary payer is reporting the effect of what the primary already paid — informational, not a denial. The X12 description reads: "The impact of prior payer(s) adjudication, including payments and/or adjustments."
How do I fix a OA-23 denial?
Confirm the primary payment posted to the same claim before reconciling. Post the secondary’s adjudication and move any remaining balance to the correct party. No appeal is warranted unless the secondary miscalculated against the primary remittance.
Can OA-23 be billed to the patient?
No. This is a contractual adjustment, and participating provider agreements generally prohibit billing the patient for it.
Related denial codes
Related billing terms
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General revenue-cycle guidance, not legal, coding, or payer-specific advice. Claim adjustment reason codes are maintained by X12 and are revised periodically; payer policy and your provider agreement govern in any specific case. Always read the remark codes transmitted with the denial — they frequently carry the detail this code does not.