title: Retroactivity and administrative rulemaking.
authors: University of Pittsburgh School of Law.
authors: W V
authors: WV
authors: Luneburg
mesh_terms: D005161:Facility Regulation and Control / Q000331:legislation & jurisprudence*; D006077:Government Agencies; D006785:Hospitals, University / Q000331:legislation & jurisprudence*; D006278:Medicare / Q000331:legislation & jurisprudence*; D011050:Policy Making; D011640:Public Policy; D012051:Reimbursement Mechanisms / Q000331:legislation & jurisprudence; D013997:Time Factors; D014481:United States; D014483:United States Dept. of Health and Human Services