CO-160: Benefit Exclusion — Activity-Related Injury/Illness

What Does CO-160 Mean?

CO-160 means the payer has applied the benefit exclusion as a contractual adjustment. The provider cannot bill the patient for this amount — it is a write-off under your contract. This typically occurs when the payer's system automatically flags the claim based on external cause codes linked to an excluded activity. If the coding was incorrect, you have a path to correct and resubmit. If the exclusion is valid but another insurer should cover the claim (auto, workers' comp, liability), redirect accordingly.

When CARC 160 appears on a remittance, the payer has determined that the patient's injury or illness was caused by an activity that falls under the benefit exclusion clause of their insurance plan. Common examples include injuries sustained during extreme sports (skydiving, bungee jumping, hang gliding), participation in illegal activities, or self-inflicted harm. The payer is not questioning whether the medical service was appropriate — it is stating that the plan does not cover injuries arising from that particular activity.

This code is driven by the ICD-10 external cause codes on the claim and the clinical documentation describing how the injury occurred. Payers use these codes to match the circumstances of the injury against their plan's exclusion list. If the external cause coding inadvertently links the injury to an excluded activity — say, using a recreation-related code when the patient simply tripped at home — the denial may be a coding error rather than a legitimate exclusion.

The financial impact depends on the group code. CO-160 is a contractual write-off: the provider absorbs the loss and cannot bill the patient. PR-160 shifts the balance to the patient, who is responsible for the full amount because their plan explicitly excludes coverage for the activity in question. In either case, if another insurer should be primary (auto insurance, workers' compensation, liability insurer), you may be able to redirect the claim to that payer. OA-160 appears less frequently and usually signals a coordination of benefits situation where another payer or program is the appropriate source of payment.

Common Causes

How to Resolve

Verify the activity exclusion is correctly applied, then either correct coding errors and resubmit, collect from the patient, or redirect to the appropriate liability insurer.

1. Audit the external cause codes Review the ICD-10 external cause codes on the claim to determine whether they accurately reflect the circumstances of the injury. Check for accidental use of recreation, sports, or activity codes.
2. Correct and resubmit if miscoded If the codes were wrong, correct them and resubmit with documentation supporting the actual cause of the injury. Include clinical notes describing the circumstances.
3. Identify alternative payer liability If the injury was genuinely caused by an excluded activity, determine whether auto insurance, workers' compensation, or a liability insurer should cover the charges.
4. Appeal with supporting evidence If the exclusion was misapplied, file an appeal with clinical records, patient statements, and any documentation proving the injury did not result from the excluded activity.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-160:

How to Prevent CO-160

• Verify external cause codes match the documented circumstances before claim submission
• Train coding staff on activity-related ICD-10 codes and how they trigger benefit exclusion reviews
• Document the circumstances of every injury thoroughly in clinical notes
• Review the patient's plan exclusions before submitting claims for activity-related injuries

General Prevention

• Verify patient insurance coverage and benefit exclusions before providing services, especially for injuries that may be linked to recreational or high-risk activities
• Ensure accurate ICD-10 external cause coding that reflects the true circumstances of the injury or illness
• Document the circumstances of the injury thoroughly in the clinical record, including the patient's own account of how the injury occurred
• Review claims for activity-related external cause codes before submission to catch potential benefit exclusion triggers
• Train coding staff on common plan exclusions related to activities and how external cause codes interact with benefit determinations

Also Filed As

The same CARC 160 may appear with different Group Codes:

Related Denial Codes