CO-P2: Non-Work Related Injury/Illness

What Does CO-P2 Mean?

CO-P2 is the standard pairing and indicates that the WC carrier has denied liability because the injury is not work-related. Under CO, this is a contractual denial — the provider writes off the amount and cannot balance-bill the patient for the WC-denied charges. The provider's recourse is to either dispute the compensability determination through the WC administrative process or redirect the claim to the patient's other insurance coverage.

When CARC P2 appears on a workers' compensation remittance, the carrier is telling you that it has investigated the claim and concluded that the injury or illness did not arise out of or in the course of the patient's employment. Because the condition is not work-related, the WC carrier has no liability for the services. This code replaces the older CARC 191 and is restricted exclusively to workers' compensation claims.

P2 most commonly appears with Group Code CO, which means the carrier is treating the denial as a contractual obligation — you cannot bill the patient for the WC-denied amount. Instead, you need to redirect the claim to the correct payer. In many cases, the patient has group health insurance or other coverage that will cover the treatment once it is properly billed outside the WC context. If you have evidence that the injury is genuinely work-related, you can challenge the carrier's compensability determination through the WC administrative dispute process.

The key distinction with P2 is that the carrier is not saying the services were medically unnecessary or improperly coded — it is saying the WC carrier is simply not the responsible payer. This means the services may be fully payable by another insurer. Providers who treat WC patients should always collect alternate insurance information at intake as a fallback against exactly this scenario.

Common Causes

How to Resolve

Verify the non-work-related determination, then either dispute it or rebill to the patient's alternate insurance.

1. Confirm the compensability decision Contact the WC carrier to understand the basis for the non-work-related determination. Request copies of any investigation reports or independent medical examination results.
2. File a WC dispute if warranted If clinical evidence supports work-relatedness, file a dispute through the jurisdiction's WC board or administrative hearing process. Attach the treating physician's causation opinion and all supporting incident documentation.
3. Redirect the claim to alternate insurance If the denial stands, rebill the services to the patient's group health plan, auto insurance, or other applicable coverage. Update the claim with non-WC billing codes and payer-specific requirements.
4. Write off the WC balance Post the CO-P2 adjustment as a contractual write-off in your practice management system. Do not transfer this amount to the patient's ledger.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-P2:

How to Prevent CO-P2

• Verify the compensability status of the WC claim with the carrier before rendering non-emergency services
• Obtain and review the employer's First Report of Injury at intake to confirm the injury circumstances support a WC claim
• Document the mechanism of injury and its occupational connection thoroughly in clinical notes from the first visit
• Collect the patient's group health insurance details at registration as a backup billing target if the WC claim is denied

General Prevention

• Verify workers' compensation coverage and confirm the injury is classified as work-related before providing services
• Obtain and review the employer's First Report of Injury to confirm work-relatedness before billing the WC carrier
• Document the mechanism of injury, workplace circumstances, and occupational connection in clinical notes
• Educate staff on workers' compensation guidelines and proper intake procedures for injury documentation
• Maintain communication with the WC carrier during treatment to stay informed of compensability decisions

Also Filed As

The same CARC P2 may appear with different Group Codes:

Related Denial Codes