The branch of medicine concerned with the delivery of comprehensive medical care to hospitalized patients. Practitioners include physicians and non-physician providers who engage in clinical care, teaching, research, or leadership in the field of general hospital medicine.(from http://www.hospitalmedicine.org/AM/Template.cfm?Section=Hospitalist_Definition)

Physicians who are employed to work exclusively in hospital settings, primarily for managed care organizations. They are the attending or primary responsible physician for the patient during hospitalization.

Medical complexes consisting of medical school, hospitals, clinics, libraries, administrative facilities, etc.