Denial Code Decoder
CO-167 — Diagnosis not covered
The diagnosis on the claim is not one the payer covers for this service. As with medical necessity, the care may be fine and the coding wrong — the documented condition may simply have been reported with a code outside the payer's covered list.
Billable to the patient? Generally not without a valid advance notice of non-coverage — review liability before moving any balance.
Where this denial is born
- Front desk
- Coding
- Claim build
- Submission
- Adjudication
This denial is usually created at the highlighted stage — that is where prevention lives.
Answer the questions — follow the path
The same questions an experienced biller asks, in order. Your answers draw the route to the right action.
Does the documentation support a covered, more specific diagnosis?
The full decision tree
Does the documentation support a covered, more specific diagnosis?
- Yes →
Correct the diagnosis and resubmit. Report the documented condition at its most specific covered code — never code FOR coverage, code what the record supports — and resubmit as a replacement.
- No →
Do you believe the policy is being misapplied?
Compare the denial against the payer's published coverage policy for the service.
- Yes →
Appeal citing the coverage policy. Quote the payer's own policy language and attach the clinical record showing the covered indication.
- No →
Resolve liability. With a valid advance notice the balance may go to the patient; without one, write off and add the service to the pre-service policy-check list.
- Yes →
Prevention
For services with narrow covered-diagnosis lists, verify the documented diagnosis against the payer policy before the claim goes out.
Related reading
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