CO-50Contractual Adjustment
Medical necessity denied
What this code means
The insurer decided the service was not medically necessary based on their coverage criteria. This is one of the most common and most frequently overturned denials.
What to do next
Appeal with your doctor clinical notes, test results, and a letter from your physician explaining why the service was necessary. Reference the insurer specific medical necessity criteria in your appeal. CO-50 denials are among the most commonly overturned in external review.
Appeal outlook: High -- approximately 44% of internal appeals succeed industry-wide
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