This study evaluated the impact of geriatric nurse practitioners (GNP) employed by nursing homes on quality of patient care and residents' outcomes during a 12-month study period. Quality of care was assessed in standardized interviews of 525 residents in five nursing homes with GNPs and 323 residents in five other nursing homes without GNPs. Each resident was interviewed up to four times during the study period (at baseline, and 3, 6, and 12 months later) to determine functional status, satisfaction with care, and physical condition at each of these points. The only significant difference between groups was that fewer newly admitted residents were hospitalized from GNP homes than from those without a GNP. The results of this interview study showed that the GNP as a nursing home employee had little impact on residents' functional status, physical condition, or satisfaction.