What department does Dr. Gregory House head in House M.D.?

Dr. Gregory House heads the Department of Diagnostic Medicine in House M.D.

The department investigates illnesses that other physicians have been unable to identify or explain. House leads a small team of doctors who examine symptoms, order tests, debate possibilities, and revise their hypotheses as new evidence appears.

Diagnostic Medicine is the professional foundation of the show. Rather than focusing on one organ system, the team draws on many fields, including infectious disease, neurology, immunology, and genetics. This broad scope allows each episode to present a different medical puzzle.

The department is fictionalized for dramatic storytelling, and the series compresses timelines and simplifies some clinical processes. Still, its basic premise reflects the real diagnostic challenge of recognizing rare diseases from incomplete or misleading information. House's leadership is defined by his extraordinary reasoning and his willingness to pursue risky ideas.