835 Denial Combination
CO-97+N346
Contractual Obligation · Service-Line Level Adjustment
Coding ErrorWhat This Combination Means
This combination indicates the service was denied as bundled or inclusive with another already-paid procedure, and the specific reason is a missing or incorrect oral cavity designation code on the claim. The payer is stating that even if the oral cavity designation were correct, the service would still be considered inclusive, but the coding deficiency prevented proper adjudication. This is typical in dental claims where tooth-specific procedures require proper tooth numbering or oral cavity area codes.
Financial Responsibility
provider writeoff
The provider must write off the denied amount per contractual obligation. The missing oral cavity designation prevented the payer from properly bundling this service with the primary procedure already paid.
N/A
Appeal Success
Immediate (write-off)
Avg. Resolution
Easy
Difficulty
No
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-97+N346 combination — not generic advice.
- 1
Verify which procedure was already paid that includes this service
Review the ERA/EOB for the primary procedure referenced in loop 2110 Service Payment Information REF to confirm the bundling relationship
- 2
Write off the contractual adjustment amount
Post the adjustment as a contractual write-off in the practice management system; this amount cannot be billed to the patient
- 3
Update billing protocols for oral cavity designation codes
Ensure future claims include complete and valid tooth numbers or oral cavity area codes to prevent adjudication delays and ensure proper bundling logic is applied
Specialty Context
How CO-97+N346 typically presents across different practice types.
Dental
Highly relevant — oral cavity designation codes (tooth numbers, quadrants, arches) are mandatory for most dental procedures and must be accurate for payer bundling edits to correctly identify inclusive services
Medical
Less common but may apply to oral surgery or maxillofacial procedures billed under medical plans that require tooth or oral cavity location codes
Behavioral Health
Individual Code References
View the standalone definition for each code in this combination.
Medicare Contractor Guidance for CARC 97
FCSO + NoridianThere are a few scenarios that exist for denial reason code CO 97. Please review the associated remittance advice remark code (RARC) noted on the remittance advice for your claim and then refer to the specific resources and tips to prevent the denial.
How to Prevent CARC 97 Denials
- ✓
RARC M15 (Bundled services): If the procedure code has a 'b' status on the Medicare Physician Fee Schedule (MPFS) database, the service should not be billed to Medicare. Check your most frequently billed procedure codes on the First Coast fee schedule lookup tool — if status is 'b', do not bill Medicare.
- ✓
RARC M144 (Pre/post-operative care): If billing for split care, coordinate split-care billing activities with other provider(s) involved in the patient's care, and ensure the surgical code is billed before the services for post-operative care are billed.
- ✓
RARC N70 (Consolidated billing): Before providing services to a Medicare beneficiary, determine if a home health episode exists. Ask the beneficiary if they are receiving home health services under a home health plan of care. Always check beneficiary eligibility prior to submitting your claim via SPOT.
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