Related or qualifying service not on the claim
This service is only paid together with another service, and the payer did not find that other service on this claim or in its history.
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 billed without its primary code on the same claim (N122).
- Drug administration billed without the drug, or the reverse.
- Interpretation billed before the test, or a follow-up service without the qualifying procedure.
The fix
Find the primary or qualifying service. Bill both on the same claim (corrected claim), or if the primary service was billed by another provider, send a note or appeal explaining it.
Appeal or corrected claim?
Corrected claim with the primary service included.
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-107 in short
What does CO-107 mean?
This service is only paid together with another service, and the payer did not find that other service on this claim or in its history. The official X12 text reads: "The related or qualifying claim/service was not identified on this claim. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present."
What usually causes a CO-107 denial?
Add-on code billed without its primary code on the same claim (N122). Drug administration billed without the drug, or the reverse. Interpretation billed before the test, or a follow-up service without the qualifying procedure.
How do I fix CO-107?
Find the primary or qualifying service. Bill both on the same claim (corrected claim), or if the primary service was billed by another provider, send a note or appeal explaining it.
Should I appeal CO-107 or send a corrected claim?
Corrected claim. Corrected claim with the primary service included.
What deadline applies to CO-107?
Timely filing limit.