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Acute hospitalizations represent substantial financial liability to closed health care systems. Among hospitalized patients, those with repeated admissions are high-cost users. Most managed care plans employ case management to control hospital use. This technique attempts to detect and fulfill unmet medical and social needs, intensify postdischarge care, identify and mobilize effective community services, and enhance primary care access. Despite the popularity of case management to control hospital use, few trials have examined its efficacy.

We conducted a randomized controlled trial of an intervention of case managers at a university-affiliated Veterans Affairs medical center. Six hundred sixty-eight patients aged 45 years or older who were discharged from the general medicine inpatient service, who had access to a telephone, and who received primary care at the hospital's clinics were …