What medical specialty does Dr. Gregory House primarily lead in House, M.D.?

Dr. Gregory House primarily leads the Diagnostic Medicine department in House, M.D.

The department handles patients whose illnesses have resisted ordinary diagnosis or treatment. House and his team gather symptoms, test hypotheses, and revise their differential diagnosis as new evidence appears. This structure gives the series its central medical-puzzle format.

House is often described as having expertise in infectious disease and nephrology, and the character is a board-certified diagnostician. Those additional specialties can make the answer seem ambiguous, but the department he leads at Princeton-Plainsboro is Diagnostic Medicine.

The show also uses “diagnostician” as a broader professional identity rather than presenting diagnosis as a single conventional specialty in every real-world hospital. The department’s unusual status is part of the fiction. House’s team members contribute specialties such as neurology, immunology, and oncology when the case requires them.