The March 26 lawsuit accuses the insurer of using outdated medical evidence to deny coverage for the treatment, which is allegedly more effective—but about twice as expensive—as traditional radiation.
Proton beam therapy is more precise than traditional radiation and thus less likely to damage healthy tissue and organs, according to the lawsuit.
United-insured patient Kate Weissman, who says she paid $95,000 for the therapy after doctors recommended it as treatment for her...
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(Updated with additional details.)