In the first year of the study, hospitalists' and nonhospitalists' patients stayed in the hospital for similar lengths of time. By year 2, hospitalists' patients stayed in the hospital an average of about half a day less than nonhospitalists' patients. Average hospital costs were similar for nonhospitalists and hospitalists in the first year but were $822 lower for hospitalists in the second year. In both years of the study, the proportions of patients who died in the hospital and within 1 to 2 months after discharge were lower among hospitalists' patients than nonhospitalists' patients.