835 Denial Combination

CO-4+N1

CO

Contractual Obligation · Service-Line Level Adjustment

What This Combination Means

Modifier inconsistent — modifier combined with POS or provider type creates a conflict.

72%

Appeal Success

5-10 days

Avg. Resolution

Easy

Difficulty

Yes

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-4+N1 combination — not generic advice.

  1. 1

    Review denial details for CO-4-N1 and identify the specific issue.

  2. 2

    Pull the relevant documentation (records, auth, NPI information) supporting this claim.

  3. 3

    Correct the identified error or gather required documentation.

  4. 4

    Resubmit as a corrected claim or submit an appeal with supporting documentation.

  5. 5

    Follow up with the payer within 10-15 business days to confirm adjudication.

Specialty Context

How CO-4+N1 typically presents across different practice types.

Dental

Apply dental billing best practices for CO-4-N1 denial resolution.

Medical

Apply medical billing guidelines for CO-4-N1 denial — verify payer-specific requirements.

Behavioral Health

Apply behavioral health billing standards for CO-4-N1 — confirm MHPAEA compliance.

Individual Code References

View the standalone definition for each code in this combination.

CARC 4RARC N1

Decode every 835 combination automatically

Arceum Pro reads your ERA files and surfaces the combined interpretation + recovery steps for every denial — no manual lookups.

Join the Waitlist →
← Back to Combo LookupBrowse All Codes →