In House M.D., what medical specialty is practiced by Gregory House’s diagnostic department?

Gregory House’s department in House M.D. is called diagnostic medicine.

The department investigates difficult cases that other doctors have not been able to solve. House leads a small team that reviews symptoms, proposes possible diagnoses, orders tests and revises theories as new evidence appears. This structure gives the series its characteristic medical-mystery format.

Diagnostic medicine is not presented as a single narrow organ-based specialty like cardiology or nephrology. Instead, the fictional department draws on multiple fields because unexplained cases can involve several body systems. The team therefore consults specialists and uses knowledge from infectious disease, neurology, oncology and other areas.

Some descriptions call House an infectious-disease specialist or nephrologist, reflecting his stated medical training and board certifications. However, the department he heads at Princeton-Plainsboro is diagnostic medicine. That distinction explains why the show’s cases range across many specialties rather than staying within one clinical field.