EOB denial code OA-23: what it means

What it means

This adjustment reflects what a prior insurer already paid or adjusted. It is an accounting line showing the effect of the primary payer's decision, not a new denial.

Other Adjustment — used when neither CO nor PR applies, often for coordination-of-benefits accounting between payers.

Official X12 description

“The impact of prior payer(s) adjudication including payments and/or adjustments”

Typical cause

You have more than one plan; this line records how the secondary plan accounted for the primary plan's payment.

What to do next

1. 1Compare this with the EOB from your primary plan to confirm the numbers line up.
2. 2No action is usually needed unless the prior-payer amount looks wrong.