CARC CO-97The benefit for this service is included in the payment/allowance for ...2026 Appeals, Prevention & Recovery Guide
Root Causes
Why CO-97 fires. Understanding the cause is the first step. Fix the cause, not just the symptom.
Service is bundled into the payment for another procedure billed on the same date of service. CO-97 fires when a National Correct Coding Initiative (NCCI) edit, payer-specific bundling rule, or global surgical package consumes the line.
- NCCI Procedure-to-Procedure (PTP) edit. The column 2 code is bundled into the column 1 code
- Service falls within a 0/10/90 day global surgical period for an earlier procedure
- E/M billed on the same day as a minor procedure without modifier 25
- Lab panel components billed individually instead of using the panel code
- Payer-specific bundling beyond NCCI (commercial payers like UnitedHealthcare and Anthem maintain extensive proprietary Reimbursement Policy libraries with bundles beyond CMS NCCI edits)
Quick Reference
Appeal Strategy
What to attach, what to skip, and where to file. Built from CERT and RAC reports plus major payer manuals.
CO-97 appeals win when documentation supports a separate identifiable service. Attach:
- Two separate progress notes if the second service was distinct (or one note with clearly delineated sections)
- A modifier 25 (E/M with procedure) or 59 / XEPSU (distinct procedural service) addition with a corrected claim, NOT a written appeal
- NCCI lookup printout showing the edit was bypassable (modifier indicator 1) and your modifier rationale
If the edit is NCCI Modifier Indicator 0 (absolute bundling), the code combination cannot be unbundled regardless of clinical justification. Do not appeal those. Fix the coding for next time.
60 percent of denied claims are never resubmitted. That is permanent revenue loss. Our AR team works every CO-97 line under aging buckets, files appeals within 48 hours, and recovers what most billers write off.
Prevention Workflow
The cheapest denial is the one that never fires. Build these checks into the front-end workflow.
Run NCCI edits in your scrubber BEFORE submission. All major clearinghouses include this. Train coders on global period rules (0/10/90 day) and the specific minor-procedure list. Audit your modifier 25 and 59 usage quarterly. Both are top OIG audit targets and an unsupported modifier on appeal puts the entire claim at risk. Subscribe to the NCCI Quarterly Update Bundle from CMS. Payers adopt new edits within 60 to 90 days.
Practices that build CO-97 prevention into eligibility, scrubber rules, and charge-capture see 40 to 70 percent reduction in this denial type within 90 days. Catch upstream beats appeal downstream every time.
The cost of denials, in real numbers
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Everything about CO-97
What does denial code CO-97 mean?
The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present
Can CO-97 be appealed successfully?
Overturn rate: High when corrected claim is filed with the right modifier and supporting documentation. Successful appeals require documentation that directly addresses the payer's stated reason for denial. See the Appeal Strategy section for the exact attachments and modifier paths that win.
How do I prevent CO-97 denials?
Run NCCI edits in your scrubber BEFORE submission. All major clearinghouses include this. Train coders on global period rules (0/10/90 day) and the specific minor-procedure list. Audit your modifier 25 and 59 usage quarterly. Both are top OIG audit targets and an unsupported modifier on appeal puts the entire claim at risk. Subscribe to the NCCI Quarterly Update Bundle from CMS. Payers adopt new edits within 60 to 90 days.
CARC codes maintained by X12 N. Overturn rates reflect aggregated CERT, RAC, and payer-published data. Actual results vary by payer, contract, and clinical specifics. Curated content reviewed by AAPC-certified coders.
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