Mealey's (October 16, 2019, 1:23 PM EDT) -- SEATTLE — An insurer erred when it denied coverage for proton beam therapy as not medically necessary to treat for a man’s prostate cancer, a divided Washington Supreme Court held Oct. 3 (John Strauss, et al. v. Premera Blue Cross, No. 74600-6-I, Wash. Sup., 2019 Wash. LEXIS 593)....