835 Denial Combination
CO-4+N517
Contractual Obligation · Service-Line Level Adjustment
What This Combination Means
Modifier inconsistent — the modifier submitted is not valid for the procedure code in the listed place of service.
75%
Appeal Success
5-10 days
Avg. Resolution
Easy
Difficulty
Yes
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-4+N517 combination — not generic advice.
- 1
Review denial details for CO-4-N517 and identify the specific issue.
- 2
Pull the relevant documentation (records, auth, NPI information) supporting this claim.
- 3
Correct the identified error or gather required documentation.
- 4
Resubmit as a corrected claim or submit an appeal with supporting documentation.
- 5
Follow up with the payer within 10-15 business days to confirm adjudication.
Specialty Context
How CO-4+N517 typically presents across different practice types.
Dental
Apply dental billing best practices for CO-4-N517 denial resolution.
Medical
Apply medical billing guidelines for CO-4-N517 denial — verify payer-specific requirements.
Behavioral Health
Apply behavioral health billing standards for CO-4-N517 — confirm MHPAEA compliance.
Individual Code References
View the standalone definition for each code in this combination.
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