Denial code

CO 11

The diagnosis does not match the procedure billed.

Fix and resubmit CO

What CO 11 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?

Fix and resubmit. This is a correction, not an appeal. Appealing burns the deadline.

Why it fires

In the order we see it.

  1. The diagnosis does not support the procedure billed.

What to do

Recode from the chart and resubmit.

What actually wins it

The documentation, not the argument.

A recode from what the record actually documents.

The common mistake. Do not appeal without rereading the note. If the coding was wrong, correcting it is faster than arguing.

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

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