Rush v. Parham, 625 F.2d 1150, 1155 (5th Cir. 1980);1 42 C.F.R. ?? 440.230 (???(d) The agency may place appropriate limits on a service based on such criteria as medical necessity or on utilization control procedures.???); see 42 U.S.C. ?? 1396d(r)(5).