In House M.D., which hospital department does Gregory House direct?

Gregory House directs the Department of Diagnostic Medicine in House M.D.

The department handles unusual or unexplained illnesses that have resisted ordinary diagnosis. House leads a small team of doctors who gather patient histories, order tests, debate possibilities, and revise their hypotheses as new evidence appears.

Diagnostic medicine is the organizing idea of the series, but the department is presented in a dramatized form. Real hospitals use diagnostic expertise across many specialties rather than relying on one small team to solve nearly every baffling case.

House's team frequently consults other departments, including oncology, neurology, surgery, and infectious disease. That collaboration allows episodes to introduce specialist knowledge while keeping the diagnostic department at the center of the story.