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CO-230 Denial Code (Deactivated): No Matching Procedure Code

CO-230 meant there was no available or correlating CPT or HCPCS code to describe the service billed to a property and casualty payer. X12 deactivated it and its notes direct payers to code P9.

X12 deactivated CARC230 on July 1, 2014. Payers should no longer use it on new remittances, but it can still appear on older ERAs, corrected claims, and appeals.

Code: CO-230 (CARC 230)
Status: Deactivated StoppedJuly 1, 2014 (in use since January 25, 2009).
Code set: Claim Adjustment Reason Codes (CARC)
Group codes: CO (Contractual Obligation): The adjustment stayed with the provider; the code did not make the service a patient responsibility.
Official description: No available or correlating CPT/HCPCS code to describe this service. Note: Used only by Property and Casualty.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What CO-230 meant

CARC 230 was used only by property and casualty payers. It explained that the service on the bill had no matching CPT or HCPCS code, so the payer could not map it to anything in its pricing system. Services such as certain reports, travel, or unusual supplies sometimes fall into this gap.

What replaced it

X12’s note is “Use code P9.” CO-P9 now carries this meaning within the property and casualty code range. If the problem is that your code exists but is missing from the payer’s fee schedule, the right code is CO-P7. In health plan billing, the reverse situation, an unlisted code billed when a specific one exists, is CO-189.

If you still see CO-230

This comes from older auto, liability, or workers’ compensation files. Contact the adjuster to learn how the payer handles uncoded services. Many jurisdictions have a by-report process that requires a detailed description and records. If the service is not payable under that jurisdiction’s rules, the line is generally written off.

CO-P9 (No available or correlating CPT/HCPCS code to describe this service.): Named replacement: no available or correlating procedure code to describe the service.
CO-P7 (The applicable fee schedule/fee database does not contain the billed code.): The fee schedule does not contain the billed code; resubmit with an appropriate one.
CO-189 ('Not otherwise classified' or 'unlisted' procedure code (CPT/HCPCS) was billed when there is a specific procedure code for this procedure/service): An unlisted code was billed when a specific code exists.

CO-230 FAQ

How is CO-230 different from CO-220?

CO-220 said the billed code was missing from the fee schedule and asked for a different code. CO-230 said no standard procedure code corresponded to the service at all.

What can a provider do with a service that has no code?

Ask the payer how it wants such services billed, typically with an unlisted code, a description, and documentation, and whether it has a by-report pricing process.

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