Denial code

CO 234

This procedure is not paid separately.

Usually recoverable CO

What CO 234 means

CO — Contractual obligation — the provider absorbs it and cannot bill the patient.

So the balance cannot move to the patient. Either the appeal recovers it or the practice absorbs it. That makes the appeal decision the whole decision on this line.

Is it worth appealing?

Usually recoverable. Appeal it. The money is usually there.

Why it fires

In the order we see it.

  1. The procedure is not separately payable under the payer's policy.

  2. An NCCI edit makes it inclusive to another service on the claim.

What to do

Check NCCI edits. If a modifier is supported by the documentation, correct and resubmit.

What actually wins it

The documentation, not the argument.

Documentation supporting a modifier, where the policy allows one.

The common mistake. Check the NCCI edit before appealing. If the pair is a hard edit, no modifier will change the outcome.

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.

Related codes

Free denial review

How much of this is sitting in your write-off pile?

Send your denial summary for the last ninety days. Four columns: payer, CARC code, count, billed amount. I will tell you which were winnable and what they were worth.

Send your denial summary No patient data. No BAA. No charge.