835 Denial Combination
CO-173+N668
Contractual Obligation · Service-Line Level Adjustment
What This Combination Means
Service/equipment was not prescribed by a physician Incomplete/invalid prescription
N/A
Appeal Success
7-14 days
Avg. Resolution
Medium
Difficulty
No
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-173+N668 combination — not generic advice.
- 1
A Redetermination request may be submitted with all relevant supporting documentation. Noridian encourages Redeterminations/Appeals be submitted using the Noridian Medicare Portal. Review applicable Local Coverage Determination (LCD), LCD Policy Article, and Documentation Checklists prior to submitting request
Specialty Context
How CO-173+N668 typically presents across different practice types.
Dental
Medical
Behavioral Health
Individual Code References
View the standalone definition for each code in this combination.
Medicare Contractor Guidance for CARC 173
NoridianService/equipment was not prescribed by a physician Incomplete/invalid prescription
How to Prevent CARC 173 Denials
- ✓
Ensure a valid order is on file in the medical record
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