The chronically mentally ill tend to receive inadequate medical care for nonpsychiatric illnesses and to have poor health care status. Their medical problems lead to excessive morbidity and mortality and adversely affect their adjustment to psychiatric illness. The authors argue that many of the barriers to medical care for these patients can be overcome by using case managers as "culture brokers"-persons who provide bridges between the worlds of the chronically mentally ill and medical providers. This paper presents the culture broker model and its roots in anthropology, and illustrates its application to the medical care of the chronically mentally ill with case examples.