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Background: Rates of psychopathology are often underestimated in primary care populations, especially older patient groups. High medical utilization is often a reflection of psychopathology and/or emotional distress. Increased awareness of primary care patients' emotional distress can help to improve well-being and reduce unnecessary high utilization of medical services. This study aimed to assess the degree of psychopathology present in a sample of older health maintenance organization (HMO) patients who utilized higher-than-average amounts of medical services.Methods: Patients in a large HMO aged 55 years old and older who exceeded the mean number of inpatient and outpatient visits in the past year were recruited. Sixty-nine patients, mostly female (69%) and white (93%), volunteered. Patients were assessed with the Medical Outcomes Study SF-36 health survey and the Symptom Checklist-90-Revised (SCL-90-R).Results: Respondents made a mean of 41 visits in the previous year to medical providers, versus 24 visits per year for the average patient of this age in the HMO. Significant elevations on SCL-90-R global psychopathology, obsessive-compulsive, somatization, and depression scales were found. All patients met SCL-90-R criteria for psychiatric caseness. SF-36 health ratings were comparable with those of patients with chronic medical conditions assessed in other SF-36 samples.Conclusions: Older high-utilizing HMO patients show significantly more psychopathology and view their health status as poorer than that of other medical subpopulations; results suggest that care for these problems is rarely received. [ABSTRACT FROM AUTHOR]