What is House M.D.’s fictional department specializing in difficult diagnoses called?

House M.D.’s fictional department specializing in difficult diagnoses is called diagnostic medicine.

Gregory House leads the department at Princeton-Plainsboro Teaching Hospital, where his team investigates cases that other doctors have not solved. The department’s work draws on many medical specialties because rare illnesses can affect several organs or resemble more common conditions.

Diagnostic medicine is used in the series as a distinctive department rather than as a narrowly defined routine specialty. House’s team performs tests, consults specialists, observes symptoms, and revises hypotheses as new evidence appears. Their cases are dramatized, so the speed and certainty of some diagnoses are heightened for television.

Viewers may confuse diagnostic medicine with internal medicine. Internal medicine is a broad real-world medical field, while the show’s department is a narrative setting built around complex diagnostic puzzles. The department’s name is therefore the precise answer when asking what House heads.