The authors describe a psychiatric demonstration program in a prepaid group practice plan. Among adults aged 15 and older, the average annual consultation rate was 11 per 1,000 enrollees and the treatment rate 7.5 per 1,000. Treatment visits in one year averaged 14.2 services; patients treated by psychiatrists had fewer average visits than those of social workers. It was noted that family doctors in the medical group altered their referral practices following two years of contact with the mental health service.Abstract Teaser