CO-50 Denial Code
What it means
The insurer decided this care wasn't medically necessary, so it won't pay. This second-guesses your doctor's judgment.
Why it happens
The plan's clinical reviewer felt the documentation didn't meet its medical-necessity criteria (e.g., conservative treatment not tried first).
What to do
This is one of the most winnable appeals (~70% overturned). Get a letter of medical necessity from your doctor, address the exact criterion cited, and file an internal appeal; escalate to external review if needed.
Can you appeal it?
Yes - strong appeal candidate.
Official description
Non-covered service because it is not deemed a 'medical necessity' by the payer.
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