EOB denial code CO-B7: what it means

What it means

On the date of service, the provider was not certified or eligible with the insurer to be paid for this service.

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

Official X12 description

“This provider was not certified/eligible to be paid for this procedure/service on this date of service”

Typical cause

A credentialing or enrollment gap — the provider's eligibility was not active for this service on that date.

What to do next

1. 1This is a provider credentialing/enrollment issue, not a patient-owed amount.
2. 2Ask the provider's billing office to confirm their enrollment status and resubmit or appeal.