title: A look back at PPS: DRGs after four years.
mesh_terms: D001509:Bed Occupancy; D003953:Diagnosis-Related Groups; D004469:Economics, Hospital / Q000639:trends*; D006744:Hospital Bed Capacity, 100 to 299; D007902:Length of Stay; D008824:Michigan; D011445:Prospective Payment System; D013223:Statistics as Topic