835 Denial Combination
CO-97+N19
Contractual Obligation · Service-Line Level Adjustment
Coding ErrorWhat This Combination Means
This combination indicates payment for the submitted procedure code is bundled into another primary procedure that was already paid on this or a prior claim. The RARC clarifies that the denied service is considered incidental or integral to the primary procedure, meaning separate reimbursement is not permitted under the contract. The provider must write off the bundled amount and cannot transfer the balance to the patient.
Financial Responsibility
provider writeoff
The provider is contractually obligated to write off this amount because the service is bundled into payment for another procedure. The patient has no financial liability for this adjustment.
N/A
Appeal Success
Immediate (write-off)
Avg. Resolution
Easy
Difficulty
No
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-97+N19 combination — not generic advice.
- 1
Identify the primary procedure to which this service was bundled
Review the claim's remittance advice and reference the 835 Healthcare Policy Identification Segment (loop 2110) to determine which procedure code received the comprehensive payment that included this service
- 2
Verify bundling rules in your contract and payer fee schedule
Confirm that the incidental procedure code is correctly bundled with the primary procedure according to NCCI edits, CCI edits, or payer-specific bundling policies to ensure the adjustment is valid
- 3
Post the contractual adjustment as a write-off
Apply the CO-97 adjustment to the patient account, ensuring the bundled amount is written off and not transferred to patient responsibility, then update coding protocols to prevent future duplicate billing of bundled services
Specialty Context
How CO-97+N19 typically presents across different practice types.
Dental
Common when separate codes are billed for procedures bundled into comprehensive treatment (e.g., scaling/root planing components billed separately when included in periodontal therapy codes).
Medical
Frequently occurs with surgical procedures where assistant surgeon, anesthesia add-ons, or minor ancillary procedures are bundled into the primary surgical code, or when E/M services are bundled with procedures on the same date.
Behavioral Health
May apply when brief intervention codes or add-on psychotherapy codes are billed alongside comprehensive session codes that already include those components.
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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