835 Denial Combination
CO-97+N522
Contractual Obligation · Service-Line Level Adjustment
Coding ErrorWhat This Combination Means
This combination indicates the service was denied because it is being processed or has already been processed as a crossover claim to another payer, and payment for this service is bundled with another already-adjudicated claim. The payer is treating this as a duplicate submission that is being automatically forwarded to secondary insurance, making the adjustment contractual rather than requiring provider action.
Financial Responsibility
other payer
The provider must write off this amount from the primary payer because the claim is being processed as a crossover to secondary insurance, where the service benefit is already included in another adjudicated procedure.
N/A
Appeal Success
Immediate (write-off and crossover tracking)
Avg. Resolution
Easy
Difficulty
No
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-97+N522 combination — not generic advice.
- 1
Verify crossover claim transmission to secondary payer
Confirm that the claim has been or will be automatically forwarded to the secondary insurance as indicated by the crossover processing status
- 2
Post contractual adjustment to patient account
Apply the CO adjustment as a provider write-off since this represents bundled payment already processed or being processed through coordination of benefits
- 3
Monitor secondary payer EOB for final payment determination
Track the crossover claim to ensure secondary insurance receives and processes the claim for any remaining patient responsibility
Specialty Context
How CO-97+N522 typically presents across different practice types.
Dental
Rare in dental billing as crossover claims typically involve Medicare/Medicaid coordination more common in medical settings; may occur with dual-eligible patients receiving medical dental services
Medical
Common in Medicare Advantage or Medicare supplemental scenarios where claims automatically cross over to secondary insurance; frequently seen with bundled procedures like global surgical packages or E&M services included in procedure payments
Behavioral Health
May occur when behavioral health services are carved out to specialty plans but primary medical insurance processes first and crosses over; often seen in integrated care models with multiple payers
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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