OA: Other adjustment, most often coordination of benefits.
So it belongs to neither side yet. Work the coordination of benefits before you treat any of it as lost money.
The same code, a different prefix. 22 also arrives as CO 22. The reason for the denial is the same. The prefix decides who pays for it, so the next step is not the same. If your remit says CO 22, read that page instead.
Fix and resubmit. This is a correction, not an appeal. Appealing burns the deadline.
In the order we see it.
Another plan is primary for this patient on this date of service.
Get the primary EOB and rebill as secondary. Not an appeal.
The documentation, not the argument.
The common mistake. Do not appeal this. It is a rebill as secondary, and appealing delays the money.
Where this comes from. This is our own reading of the code, not the payer's and not a copy of the standards text. We classify it from how these denials actually resolve. Where we are unsure, we say so rather than guessing.
Another plan should pay first. So it belongs to neither side yet. Work the coordination of benefits before you treat any of it as lost money.
This is our plain-English wording, not the official X12 text. X12 asserts copyright over the published descriptions, so we write our own and say what it means for the money rather than restating the code.
The adjustment code says the claim was reduced. The remark code printed next to it says why, and it is the one that tells you what to send back.
| Remark | What it means |
|---|---|
| MA04 | This was billed as a secondary claim and the payer has no record of what the primary did with it. |
| N522 | This duplicates a claim that is already crossing over from another payer. |
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