The issue of supposedly high mortality rates among psychiatric patients discharged from mental hospitals after the implementation in Italy of Law 180 is controversial. We have studied a cohort of 1858 long-term psychiatric inpatients of Public Mental Hospitals in the area of Rome (Italy), followed up for 9 years during and after the implementation of Law 180. As expected, age adjusted mortality rates were higher than those observed in the general population living in the study area, and death rates among patients with "organic mental disorders" were higher than those among patients with "functional disorders". No difference in death rates was observed between the group of discharged patients and that of patients not yet discharged.