Statutory bar on judicial review of prospective payment rates bars review of "step-two" rates and any formulae inextricably intertwined.
https://www.cadc.uscourts.gov/internet/opinions.nsf/0A1B7A5BDA2046B4852582A600521E8C/$file/16-5267-1734989.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.