(May 3, 2018, 1:50 PM EDT) -- LOS ANGELES — Medicare’s statutory and regulatory scheme preempts breach of contract claims brought by California’s largest for-profit operator of hospitals alleging underpayment of claims, a Medicare Advantage insurer told a federal judge April 30 (Prime Healthcare Services Inc. v. Humana Insurance Co. et al., No. 16-1097, C.D. Calif.)....