(March 20, 2018, 10:53 AM EDT) -- WASHINGTON, D.C. — A payment dispute between private medical providers and a private health insurer involving Medicare Advantage plans is not subject to the Medicare administrative appeals process, 11 hospitals tell the U.S. Supreme Court March 9 in a petition for writ of certiorari (Atlanta Medical Center Inc., et al. v. Care Improvement Plus South Central Insurance Co., No. 17-1283, U.S. Sup.)....