CO-50 — Not deemed medically necessary
Claim-adjustment reason code 50 · typically reported as CO-50 or PR-50
What it means
The payer says the item isn’t medically necessary under its coverage policy for the diagnosis/situation billed. The heavyweight DME denial.
Why DME claims hit it
- LCD coverage criteria not evidenced (e.g., CPAP without a qualifying sleep study/AHI)
- Face-to-face or SWO documentation missing elements the policy requires
- Quantity/upgrade beyond what the policy covers for the dx
How to fix it
- Pull the exact LCD/policy article; build a point-by-point criteria checklist
- Assemble the clinical record: F2F notes, test results, SWO, progress notes proving each criterion
- Submit a redetermination/appeal with a cover letter mapping evidence to criteria
Appeal posture
Yes — this is the classic appealable denial. Win rates are good when documentation actually meets criteria; hopeless when it doesn’t, so triage first.
Related denial codes
CO-11 — Diagnosis inconsistent with the procedureCO-167 — Diagnosis not coveredCO-55 — Experimental / investigationalCO-150 — Documentation doesn’t support this level of serviceCO-226 — Requested records not received from provider
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