CO-189Contractual ObligationCoding
CO-189 Denial Code: Unlisted code billed when specific code exists
You billed a 'not otherwise classified' or unlisted code, but a specific CPT/HCPCS exists for the service.
Why CO-189 happens
- ●Charge master defaulting to unlisted codes
- ●New codes released without updating billing patterns
How to fix a CO-189 denial
- 1
Identify the specific code and rebill — don't appeal, recode
How to prevent it
Quarterly review of unlisted-code usage; each occurrence should be justified.
Drowning in CO-189 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.