835 Denial Combination
CO-252+N275
Contractual Obligation · Claim-Level Adjustment
What This Combination Means
Required attachment missing — the payer is requesting additional medical information or documentation (N275) before the claim can be processed. This is a broad 'additional info needed' remark often used for itemized bills, records, or coordination of benefits documentation.
82%
Appeal Success
10-21 days
Avg. Resolution
Easy
Difficulty
Yes
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-252+N275 combination — not generic advice.
- 1
Call the payer or check the portal to identify exactly what additional information they need — the remark N275 alone is broad.
- 2
Gather the requested documentation and ensure it is complete, legible, and covers the relevant service dates.
- 3
Submit via the payer's required method with the claim number clearly referenced.
- 4
If the payer is requesting an itemized bill, generate one from your practice management system and verify all charges align with the claim submitted.
- 5
Follow up to confirm receipt and request a re-adjudication timeline.
Specialty Context
How CO-252+N275 typically presents across different practice types.
Dental
Additional documentation requests may include the full treatment plan, periodontal charting, or a narrative explaining why a procedure was necessary.
Medical
Common for inpatient claims requiring itemized bills, for ambulance claims requiring physician certification, and for durable medical equipment claims requiring certificates of medical necessity.
Behavioral Health
Payers may request the initial assessment, diagnosis, and treatment plan for ongoing therapy claims, especially for outpatient behavioral health carve-outs.
Individual Code References
View the standalone definition for each code in this combination.
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