Routine or preventive exam not covered
The payer treats this service as a routine or preventive exam that the plan does not cover, or does not cover more than once in a period.
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
- Preventive visit billed with a problem diagnosis, or a problem visit billed with a preventive diagnosis code (Z00, Z01).
- A second preventive exam inside the plan year.
- Medicare: a routine physical billed instead of the Annual Wellness Visit (G0438 or G0439) or the Welcome to Medicare visit.
The fix
Match the diagnosis to the service. For Medicare, bill the wellness visit codes, not 9939x. If both a preventive and a problem service happened, bill both with modifier 25 and separate diagnoses. Correct and resubmit.
Appeal or corrected claim?
Corrected claim for a coding mismatch. Patient responsibility if the plan truly excludes it and the patient was told.
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-49 in short
What does CO-49 mean?
The payer treats this service as a routine or preventive exam that the plan does not cover, or does not cover more than once in a period. The official X12 text reads: "This is a non-covered service because it is a routine/preventive exam or a diagnostic/screening procedure done in conjunction with a routine/preventive exam. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present."
What usually causes a CO-49 denial?
Preventive visit billed with a problem diagnosis, or a problem visit billed with a preventive diagnosis code (Z00, Z01). A second preventive exam inside the plan year. Medicare: a routine physical billed instead of the Annual Wellness Visit (G0438 or G0439) or the Welcome to Medicare visit.
How do I fix CO-49?
Match the diagnosis to the service. For Medicare, bill the wellness visit codes, not 9939x. If both a preventive and a problem service happened, bill both with modifier 25 and separate diagnoses. Correct and resubmit.
Should I appeal CO-49 or send a corrected claim?
Correct or appeal (see note). Corrected claim for a coding mismatch. Patient responsibility if the plan truly excludes it and the patient was told.
What deadline applies to CO-49?
Timely filing limit.