OA-23
OA · Other Adjustment
OA-23 Denial Code: Reconciliation of the prior payer's payments and adjustments
An informational secondary-claim adjustment showing how the primary payer already adjudicated the claim. Not a denial - it reconciles the secondary payer's math with the primary's payment.
- Group code
- OA - Other Adjustment
- Code type
- CARC
- Billable to patient?
- No - informational COB adjustment
- Appealable?
- Not applicable - informational
- Category
- Coordination of Benefits
- Common pairing
- MA04
On a remittance
CAS*OA*23*125.00On a paper EOB it shows as OA-23.What OA-23 means
OA-23 appears on secondary (coordination-of-benefits) remittances. It represents the amount the primary payer already paid or adjusted so the secondary payer's calculation reconciles. It is informational, not a denial - normally no action is needed beyond standard COB posting. If it looks wrong, verify the primary EOB was transmitted correctly.
Common causes
- The claim was processed as secondary and reflects the primary payer's payment and adjustments.
- Coordination of benefits between two payers.
- A Medicare crossover claim sent to a secondary payer.
How to fix it
- Post the secondary remittance normally - OA-23 is informational.
- Confirm the primary EOB and payment were transmitted accurately if the balance looks off.
- If the secondary underpaid based on wrong primary data, resubmit with the correct primary EOB.
How to prevent it
- Ensure accurate COB order and primary EOB attachment on secondary claims.
- Reconcile primary vs secondary payments during posting.
- Keep coordination-of-benefits records current with payers.
Not applicable - informationalOA-23 is an informational coordination-of-benefits adjustment, not a denial. There is normally nothing to appeal; verify the primary payer's data only if the secondary calculation looks wrong.