What does CO 226 mean?

The payer asked you for information and did not get it, or did not get enough. Contractual obligation. The provider absorbs it and cannot bill the patient.

Why does CO 226 happen?

A records request went to an old address or a fax nobody watches. Records were sent but arrived after the payer's clock ran out. What was sent did not include the specific item requested.

What documentation wins a CO 226 appeal?

The payer's original request letter, which says what and by when. Proof of what was sent and when, including the transmission record.

CO 226 denial code description — what it means and how to appeal it

Q: Can you appeal CO 226?

Usually recoverable. Find the original request, send exactly what it asked for, and send it in the format they asked for. Most of these are lost letters, not refusals.

What CO 226 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.

A records request went to an old address or a fax nobody watches.
Records were sent but arrived after the payer's clock ran out.
What was sent did not include the specific item requested.

What to do

Find the original request, send exactly what it asked for, and send it in the format they asked for. Most of these are lost letters, not refusals.

What actually wins it

The documentation, not the argument.

The payer's original request letter, which says what and by when.
Proof of what was sent and when, including the transmission record.

The common mistake. Do not resend the whole chart. A payer that asked for one operative note and receives ninety pages often denies again for the same reason.

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.

CO 226 description

The payer asked you for information and did not get it, or did not get enough. 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.

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.

CO 226 denial code