835 Denial Combination
CO-16+N56
Contractual Obligation · Claim-Level Adjustment
What This Combination Means
Missing or incomplete — the primary insurer's information or EOB is not included with this secondary claim.
92%
Appeal Success
3-7 days
Avg. Resolution
Easy
Difficulty
Yes
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-16+N56 combination — not generic advice.
- 1
Attach the primary payer's EOB to the secondary claim.
- 2
Enter the primary payer's payment information in the appropriate claim fields.
- 3
Resubmit as a corrected secondary claim with the primary EOB attached.
Specialty Context
How CO-16+N56 typically presents across different practice types.
Dental
Verify missing or incomplete — the primary insurer's information or eob is not included with this secondary claim per your dental plan contract and documentation requirements.
Medical
Confirm missing or incomplete — the primary insurer's information or eob is not included with this secondary claim against payer policy and submit corrected claim as needed.
Behavioral Health
Apply behavioral health parity rules and confirm missing or incomplete — the primary insurer's information or eob is not included with this secondary claim per MHPAEA standards.
Individual Code References
View the standalone definition for each code in this combination.
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