The Mount Sinai Visiting Doctors program, a joint program of Mount Sinai Medical Center's Departments of Medicine and Geriatrics, is a large multidisciplinary teaching, research, and clinical care initiative serving homebound adults in Manhattan since 1995. Caring for more than 1,000 patients annually, the physicians of Visiting Doctors make more than 6,000 urgent and routine visits each year, making it the largest program of its kind in the country. Services include 24-hour physician availability, palliative care, social work case management, collaboration with nursing agencies, and in-home specialty consultation. The program serves many individuals who have previously received inadequate and inconsistent medical care. Patients are referred by social service agencies, local physicians, and hospitals and are primarily frail older individuals with complex needs. Funded by Mount Sinai and private support, the program serves as a major teaching site for medical, nursing, and social work trainees interested in home-based primary care.