CO-153Contractual ObligationMedical Necessity
CO-153 Denial Code: Dosage not supported
The payer says submitted information doesn't support the billed drug dosage — units, strength, or frequency look wrong for the diagnosis or patient.
Why CO-153 happens
- ●Units-of-service errors (billing milligrams as units, classic MUE trap)
- ●Dosage above policy limits without documented rationale
How to fix a CO-153 denial
- 1
Recalculate billing units against the HCPCS descriptor; rebill corrected units
- 2
If dosage is clinically intended, appeal with weight-based dosing rationale and records
How to prevent it
Hard-stop unit calculators for high-cost drugs (J-codes) in charge entry.
Drowning in CO-153 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.