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CO-P9 Denial Code: No Matching CPT/HCPCS Code (P&C)

CO-P9 means a property and casualty payer determined there's no available or correlating CPT or HCPCS code to describe the service billed, so it can't price it under its rules. It usually involves unusual services, supplies, or charges outside standard code sets.

Quick facts

Code
CO-P9 (CARC P9)
Status
Active In use since November 1, 2013.
Code set
Claim Adjustment Reason Codes (CARC)
Group codes
  • CO (Contractual Obligation): The usual group. The provider absorbs the amount unless the payer accepts a code or description on resubmission; state rules govern billing the claimant.
Official description
No available or correlating CPT/HCPCS code to describe this service. To be used for Property and Casualty only.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What CO-P9 means

CARC P9 says no available or correlating CPT/HCPCS code to describe this service. X12 limits it to property and casualty claims. It replaced deactivated CARC 230.

P&C carriers and their bill review vendors price medical bills by code. When a line describes something that has no CPT or HCPCS code, and nothing in the applicable fee schedule correlates to it, the carrier can’t price it and adjusts it with CO-P9.

This is different from CO-P7. With P7, a real code exists but the state schedule doesn’t list it, so you’re asked to rebill. With P9, the carrier is saying no suitable code exists at all for what you billed.

Common causes

  • Administrative or convenience charges, such as record copying, form completion, or missed appointment fees.
  • Custom items or services without a standard code.
  • Internal charge codes sent instead of CPT or HCPCS codes.
  • Descriptions in place of codes on paper bills.
  • Reports or evaluations the carrier didn’t request (N629 sometimes appears with these).

How to fix it

  1. Check whether a code actually exists. Search CPT, HCPCS, and the state fee schedule, including state-specific and by-report codes.
  2. If a code exists, resubmit using it, with documentation if the state or carrier requires it.
  3. If the state schedule allows by-report billing, use its method and include a detailed description and invoice where applicable.
  4. If the service is simply not payable under state rules, accept the adjustment.
  5. Check state balance billing rules before billing the claimant.

How to prevent it

  • Map internal charge codes to CPT, HCPCS, or state codes before billing P&C carriers.
  • Know which administrative charges each state allows, such as report fees.
  • Get authorization for special reports or unusual services in advance where possible.
  • Review P&C bills before submission to catch lines without standard codes.

Specialty notes

Independent medical examiners, occupational medicine practices, and DME suppliers are the most likely to bill services and items that don’t map to standard codes.

Remark codes that may appear with CO-P9

  • N657 (This should be billed with the appropriate code for these services.): The service should be billed with an appropriate code.
  • N643 (The services billed are considered Not Covered or Non-Covered (NC) in the applicable state fee schedule.): The service is considered not covered in the applicable state fee schedule.
  • N621 (Charges for Jurisdiction required forms, reports, or chart notes are not payable.): Charges for jurisdiction-required forms, reports, or chart notes aren't payable.
  • CO-230Deactivated (No available or correlating CPT/HCPCS code to describe this service.): The deactivated code that CARC P9 replaced.
  • CO-P7 (The applicable fee schedule/fee database does not contain the billed code.): A code exists but isn't in the fee schedule; rebill with a listed code.
  • CO-P18 (Procedure is not listed in the jurisdiction fee schedule.): The code isn't listed, but the payer paid a comparable service.
  • 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, the reverse problem outside P&C.

CO-P9 FAQ

What kinds of services trigger CO-P9?

Services without a standard code, such as some administrative charges, travel, record copying, missed appointments, special reports, or items billed with free-text descriptions.

Can I get paid for a service with no code?

Sometimes. Some state fee schedules have by-report or unlisted codes, or state-specific codes for reports and forms. Check the applicable schedule and resubmit using its method.

Is CO-P9 used on health insurance claims?

No. X12 limits it to property and casualty claims.

What if the carrier is wrong and a code exists?

Resubmit using the correct CPT or HCPCS code, or ask for reconsideration and point to the code that describes the service.

Can I bill the injured person for a CO-P9 line?

It depends on the state and coverage line. Many workers' comp systems bar billing injured workers for services related to the accepted claim, so confirm the rules before sending a statement.