CO-189 — Unlisted code billed when a specific code exists
Claim-adjustment reason code 189 · typically reported as CO-189
What it means
A "not otherwise classified" (NOC/miscellaneous) code was used where the payer says a specific HCPCS exists.
Why DME claims hit it
- E1399/K0108-style miscellaneous billing for items that have their own codes
- Manufacturer crosswalk not checked (PDAC coding verification)
How to fix it
- Check the PDAC product-classification list for the item; bill the specific code
Appeal posture
No — recode. If no specific code truly fits, document why with the NOC submission.
Related denial codes
CO-181 — Procedure code invalid on the date of serviceCO-16 — Claim lacks information or has a submission error
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