835 Denial Combination
CO-253
Contractual Obligation · Service-Line Level Adjustment
What This Combination Means
The sequencing of diagnosis codes is incorrect — the primary diagnosis listed does not reflect the principal reason for the visit.
88%
Appeal Success
5-10 days
Avg. Resolution
Easy
Difficulty
Yes
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-253 combination — not generic advice.
- 1
Review the clinical documentation to determine the correct primary diagnosis.
- 2
Reorder the ICD-10 codes so the principal diagnosis is listed first.
- 3
Resubmit as a corrected claim with corrected diagnosis sequencing.
Specialty Context
How CO-253 typically presents across different practice types.
Dental
Verify the sequencing of diagnosis codes is incorrect — the primary diagnosis listed does not reflect the principal reason for the visit per your dental plan contract and documentation requirements.
Medical
Confirm the sequencing of diagnosis codes is incorrect — the primary diagnosis listed does not reflect the principal reason for the visit against payer policy and submit corrected claim as needed.
Behavioral Health
Apply behavioral health parity rules and confirm the sequencing of diagnosis codes is incorrect — the primary diagnosis listed does not reflect the principal reason for the visit per MHPAEA standards.
Individual Code References
View the standalone definition for each code in this combination.
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