title: Severity of illness within DRGs using a nursing patient classification system.
mesh_terms: D003953:Diagnosis-Related Groups; D006801:Humans; D007902:Length of Stay; D009738:Nursing Service, Hospital / Q000191:economics* / Q000458:organization & administration; D010361:Patients / Q000145:classification*; D012720:Severity of Illness Index; D014481:United States