What does denial code OA-23 mean?

OA-23 records the impact of the prior payer's adjudication on this payer's payment. It appears on secondary claims and is normal coordination-of-benefits accounting rather than a denial.

Why did my secondary payer pay nothing with OA-23?

Usually because the primary's payment already met or exceeded the secondary's allowed amount, which is a correct result under non-duplication coordination. Verify the primary's EOB values were transmitted accurately before assuming the payment is wrong.

OA-23: Impact of prior payer's adjudication

OA-23 appears on secondary claims and records the effect of the primary payer's adjudication on the secondary's payment. It is normal coordination-of-benefits accounting rather than a denial. It becomes worth investigating when the secondary pays nothing and the combined payments fall short of the allowed amount, which usually means the primary's EOB data was transmitted incorrectly.

What it means: This payer adjusted its payment to account for what the primary payer already allowed or paid.
Who pays the balance: Neither a denial nor patient responsibility - it records the coordination math.
Group code OA: Other Adjustment - typically a coordination-of-benefits or crossover adjustment

Why OA-23 happens

The secondary applies a standard coordination method that limits its payment to the difference between its allowance and the primary's payment.
The primary's allowed amount already exceeded the secondary's allowance, leaving nothing to pay.
The primary's EOB values were entered or transmitted incorrectly on the secondary claim.
The secondary used a different coordination method than expected, such as maintenance of benefits rather than a non-duplication approach.

How to fix a OA-23 denial

1
Verify the primary's EOB values on the secondary claim
Confirm the allowed, paid, and adjustment amounts were transmitted accurately in the claim's coordination loops. Transposed values are the most common cause of an unexpected zero payment.
2
Confirm the coordination method the secondary applies
Non-duplication plans pay far less than traditional coordination. If the plan uses non-duplication and the primary paid at or above the secondary's allowance, a zero payment is correct.
3
Determine the true remaining balance before billing anyone
Compare total payments to the allowed amount and route any genuine patient responsibility from the PR codes on the remittances, not from OA-23 itself.

Preventing OA-23 denials

Automate secondary claim generation from the primary remittance so EOB values are not rekeyed.
Record each secondary plan's coordination method so expected payment is known before the claim goes out.

OA-23 frequently asked questions

What does denial code OA-23 mean?: OA-23 records the impact of the prior payer's adjudication on this payer's payment. It appears on secondary claims and is normal coordination-of-benefits accounting rather than a denial.
Why did my secondary payer pay nothing with OA-23?: Usually because the primary's payment already met or exceeded the secondary's allowed amount, which is a correct result under non-duplication coordination. Verify the primary's EOB values were transmitted accurately before assuming the payment is wrong.

Related denial codes

CO-22 PR-1 PR-2

Denial code explanations are original plain-English summaries written for reference and are not the official X12 code descriptions. Payer handling of any code varies by contract - always verify against the remittance advice and your payer agreement before adjusting a claim.