EOB denial code CO-151: what it means

What it means

The insurer paid for fewer units of this service than were billed, because it does not think the documentation supports the quantity.

Contractual Obligation — an adjustment the provider agreed to by contract. The patient is generally not billed for CO amounts.

Official X12 description

“Payment adjusted because the payer deems the information submitted does not support this many/frequency of services”

Typical cause

The number or frequency of services billed exceeds what the insurer's policy or the submitted records support.

What to do next

1. 1Ask your provider whether the documentation supports the full quantity billed.
2. 2If it does, your provider can appeal with the supporting records.