835 Denial Combination
CO-22+N270
Contractual Obligation · Claim + Service Level Adjustment
Coordination of BenefitsWhat This Combination Means
The payer has identified that another insurer may be primary but cannot process the claim through coordination of benefits due to missing, incomplete, or invalid identifier information for the other payer or provider. The claim is denied under contractual obligation until valid other payer/provider identification is submitted, at which point the payer can determine proper COB sequencing.
Financial Responsibility
other payer
The amount is not payable by this payer until valid primary payer or provider identification is supplied. If another payer is truly primary, that payer owes the patient or provider; if this payer is ultimately primary, they will process after receiving correct COB information.
N/A
Appeal Success
2-4 weeks (corrected claim)
Avg. Resolution
Medium
Difficulty
No
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-22+N270 combination — not generic advice.
- 1
Identify the missing or invalid other payer/provider identifier
Determine whether the issue is with the primary payer's ID, NPI, or other provider identifier required for COB processing
- 2
Obtain correct primary payer information and provider identifiers from the patient or primary insurer
Verify current coverage, policy numbers, group numbers, and rendering/billing provider NPIs associated with the primary coverage
- 3
Submit a corrected claim with complete Loop 2330 (Other Subscriber) and Loop 2420 (Other Payer) information in X12 837
Include all required COB fields with valid identifiers so the secondary payer can properly coordinate benefits and determine their liability
Specialty Context
How CO-22+N270 typically presents across different practice types.
Dental
Common when patient has both medical and dental coverage and the dental payer needs complete medical carrier information to determine which plan covers specific services (e.g., oral surgery, TMJ treatment)
Medical
Frequently occurs with Medicare/Medicaid dual eligibles, retiree coverage, or patients with employer and spouse coverage when primary payer NPI or payer ID is missing from the secondary claim
Behavioral Health
Seen when behavioral health carve-out plans require complete medical plan or EAP provider identifiers to determine if services should be covered under the medical plan first
Individual Code References
View the standalone definition for each code in this combination.
Medicare Contractor Guidance for CARC 22
FCSO + Noridian + uhc + aetna + bcbs_azThis care may be covered by another payer per coordination of benefits. This denial was received because Medicare records indicate that Medicare is the secondary payer.
How to Prevent CARC 22 Denials
- ✓
Ask the patient or patient representative to complete the Medicare Secondary Payer (MSP) Questionnaire to help determine if Medicare is the primary or secondary payer. Place the completed questionnaire in the patient's file.
- ✓
Check patient eligibility and verify if Medicare is the secondary payer via SPOT.
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