835 Denial Combination
CO-97+N211
Contractual Obligation · Service-Line Level Adjustment
Coding ErrorWhat This Combination Means
Note: An informational alert accompanies this denial. This combination indicates a contractual bundling adjustment where payment for the submitted service is already included in another procedure that was previously paid. The payer explicitly states this is a non-appealable contractual adjustment. The provider must write off the adjusted amount as part of their fee schedule agreement with the payer.
Financial Responsibility
provider writeoff
The provider must write off this amount because the service is contractually bundled into another paid procedure. The patient cannot be billed 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+N211 combination — not generic advice.
- 1
Identify the primary service that contains the bundled payment
Review loop 2110 Service Payment Information REF on the ERA to locate the procedure code that was paid and includes this service
- 2
Verify bundling logic against payer's fee schedule or coding edits
Confirm the services are correctly bundled per NCCI edits or payer-specific bundling policies to ensure accurate future coding
- 3
Post the contractual adjustment as a write-off
Apply the CO adjustment to the claim in your billing system and ensure no patient balance is transferred
Specialty Context
How CO-97+N211 typically presents across different practice types.
Dental
Common for procedures like prophylaxis and fluoride treatment billed on the same date, or panoramic X-rays bundled with full mouth series when both are performed within specific timeframes per contract.
Medical
Frequently occurs with surgical add-on codes, E/M services bundled with procedures, or assistant surgeon fees included in primary surgeon payment per CCI edits or payer bundling rules.
Behavioral Health
May apply when individual therapy is billed on the same day as group therapy or case management services that contractually include brief clinical interventions.
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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