Excess health care service utilization and costs associated with underrecognition of psychiatric comorbidity in a medical/surgical inpatient setting.

Psychiatric comorbidity is common among chronically medically ill populations and the presence of psychiatric conditions tends to be associated with increased costs and excess utilization of general medical services. The purpose of this pilot investigation was to determine whether differences in nonpsychiatric inpatient hospitalization frequency, duration, and costs existed between patients receiving outpatient psychiatric treatment and patients without identified psychiatric problems. Length of stay and cost information for patients that had at least 1 inpatient medical/surgical hospitalization during a 6-month period was extracted from the hospital's inpatient billing database (n = 10,865).