CO-167: Diagnosis not covered
Triage: Reconsider or appeal
By Dr. Daniel Turner, DC · Reviewed September 2, 2026
What does denial code CO-167 mean?
The diagnosis on the claim falls outside what the plan covers for your provider type.
What does CO-167 usually mean in a chiropractic office?
Many plans cover chiropractic only for a defined list of neuromusculoskeletal diagnoses. A headache or extremity code that one payer accepts will deny at another. On CMT lines, a missing subluxation diagnosis produces the same result.
How do you fix a CO-167 denial?
- Check the payer chiropractic policy for its covered diagnosis list.
- If a covered, clinically accurate diagnosis applies to the case, correct and resubmit.
- Never swap in a diagnosis that is not clinically supported; if no covered diagnosis fits, the service is patient responsibility with the proper waiver.
What this looks like in practice
A patient presents with a headache complaint and the claim goes out with a headache diagnosis alone. The plan covers chiropractic only for a defined list of neuromusculoskeletal conditions, so the claim denies CO-167. The clinically honest cervical diagnosis that also supported the visit never made it onto the claim.
What the authorities say
Diagnosis coverage is real money: the OIG found Medicare inappropriately paid $21 million in a single year for chiropractic claims that lacked a Medicare covered primary diagnosis.
How to stop it from happening again
- ✓Keep each payer covered diagnosis list where the biller and the doctor can both see it
- ✓Code every clinically supported diagnosis, since the covered one sometimes is not the chief complaint
- ✓Never swap in an unsupported diagnosis to force coverage; that trades a denial for a fraud exposure
Appeal language that works for CO-167
A starting paragraph in the wording reviewers expect. Replace the bracketed pieces with the claim's own facts and attach the records it references.
How Cervica handles CO-167
The worklist shows which line and diagnosis triggered the denial, and payer rules track diagnosis requirements per payer so the scrubber warns before submission.
Related codes
- →CO-11 · Diagnosis inconsistent with the procedure
- →PR-170 / CO-170 · Not paid to this type of provider
- →98940 · the CPT side of this denial
Quick answers
What does denial code CO-167 mean?
The diagnosis on the claim falls outside what the plan covers for your provider type.
What does CO-167 usually mean in a chiropractic office?
Many plans cover chiropractic only for a defined list of neuromusculoskeletal diagnoses. A headache or extremity code that one payer accepts will deny at another. On CMT lines, a missing subluxation diagnosis produces the same result.
How do you fix a CO-167 denial?
Check the payer chiropractic policy for its covered diagnosis list. If a covered, clinically accurate diagnosis applies to the case, correct and resubmit. Never swap in a diagnosis that is not clinically supported; if no covered diagnosis fits, the service is patient responsibility with the proper waiver.
References
- X12, Claim Adjustment Reason Codes (the official CARC list)
- HHS Office of Inspector General, OEI-01-14-00200: CMS Should Use Targeted Tactics to Curb Questionable and Inappropriate Payments for Chiropractic Services (September 2015)
- CMS, Medicare Benefit Policy Manual, Chapter 15 (chiropractic coverage, section 240)
General information for billing teams, not legal or payer specific advice. CARC definitions belong to X12; payer policies vary and control. Verify against the payer contract before acting on any individual claim.