What is denial code CO-97?
CO-97 means the payer considers the service included in another service it already paid, so it pays nothing extra. It's the classic bundling denial.
Remittance advice, claim lines
| Service | Billed | Paid | Adjustment | Remark |
|---|---|---|---|---|
| 11102 Skin biopsy | $165.00 | $98.40 | CO-45 $66.60 | |
| 99213 Office visit | $140.00 | $0.00 | CO-97 $140.00 | M15 |
- The payer treats the visit as part of the biopsy. If the visit also addressed a separate problem, documented in the note, modifier 25 on 99213 makes it separately payable.
- M15 says separately billed services were bundled because they're components of the same procedure.
Reason code 97 reads: The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated.
Why services get bundled
Payers pay some services as a package: the visit that leads to a minor procedure, the parts of a larger procedure, the follow-up inside a global surgical period. NCCI edits and the payer’s own rules decide which pairs bundle.
When it can be unbundled
Only when the record shows a separate, distinct service: a different problem addressed in the visit (modifier 25), a different site or session (59 or the X modifiers), or unrelated care in a global period (24, 79). Adding a modifier without that documentation isn’t a fix, it’s a compliance risk.
When to let it go
If the note doesn’t support a separate service, the bundling is correct and the line should be closed, not appealed.
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