title: Appellate court voids retroactive Medicare malpractice role.
mesh_terms: D008318:Malpractice / Q000331:legislation & jurisprudence*; D006278:Medicare / Q000331:legislation & jurisprudence*; D012051:Reimbursement Mechanisms / Q000331:legislation & jurisprudence*; D013997:Time Factors; D014481:United States