Requires a qualifying service that was not received or covered
This service is only paid when a related service was also done and covered, and the payer does not find that service.
CO = Contractual Obligation. The provider owes the difference. The patient cannot be billed for this amount. The same reason code can appear with a different group code; the group decides who may be billed.
Usual causes
- Add-on code without its base code.
- Drug administration without the drug, or a supply without the procedure.
- Qualifying service denied, so the dependent service is denied too.
The fix
Bill the base service and the add-on on the same claim. If the base service was denied, fix that denial first and then resubmit both. If another provider performed the base service, appeal with that information.
Appeal or corrected claim?
Corrected claim with the qualifying service; fix the base denial first.
Deadline to watch
Timely filing limit.
Exact limits are in your payer contract or provider manual. When in doubt, send the correction or appeal this week.
CO-B15 in short
What does CO-B15 mean?
This service is only paid when a related service was also done and covered, and the payer does not find that service. The official X12 text reads: "This service/procedure requires that a qualifying service/procedure be received and covered. The qualifying other service/procedure has not been received/adjudicated. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present."
What usually causes a CO-B15 denial?
Add-on code without its base code. Drug administration without the drug, or a supply without the procedure. Qualifying service denied, so the dependent service is denied too.
How do I fix CO-B15?
Bill the base service and the add-on on the same claim. If the base service was denied, fix that denial first and then resubmit both. If another provider performed the base service, appeal with that information.
Should I appeal CO-B15 or send a corrected claim?
Corrected claim. Corrected claim with the qualifying service; fix the base denial first.
What deadline applies to CO-B15?
Timely filing limit.