Denial code CO-97
What does Denial code CO-97 mean on a medical bill?
CO-97 means the plan already paid for this line inside another line on the same claim. Payment rules treat some care as one package: the bigger procedure, or the visit itself, is meant to include the smaller pieces, so the plan pays the package and zeroes this one out. The CO letters keep that write-off on the provider's side of their contract. What makes CO-97 worth a second look is that it is also the code that turns up when the same care was billed twice, once inside the package and once on its own.
What should I watch out for with Denial code CO-97?
- Ask the billing office which paid line the plan says already includes this service, and get the answer in writing
- Check whether the CO-97 amount was quietly added back to your statement as a separate balance
- Compare the itemized bill against the EOB line by line, since CO-97 often means one of those lines should not be there
Seeing Denial code CO-97 on your own bill?
Paste the whole thing and get every line explained in plain English, with the charges worth questioning marked.
Explain my bill — free previewWritten by us in plain English. We describe codes in our own words and never publish official code-book descriptions.
Educational information only — not legal, medical, or financial advice. Always confirm the details with your provider or insurer.