What was Gregory House’s medical specialty at Princeton-Plainsboro in House M.D.?

Gregory House’s specialty at Princeton-Plainsboro in House M.D. was diagnostic medicine.

House heads the hospital’s Department of Diagnostic Medicine, where he and a small team investigate complex cases that other doctors have not solved. The department functions as the show’s main storytelling engine, allowing each episode to combine medical evidence, differential diagnosis, and interpersonal conflict.

House is also described as having expertise in infectious disease and nephrology. Those additional specialties reflect his medical training and explain why he often recognizes unusual systemic illnesses or kidney-related problems. However, the department and role most directly associated with him are diagnostic medicine and diagnostician.

The term is sometimes reduced to “doctor” or mistaken for a single organ-based specialty such as nephrology. Those answers are too broad or incomplete for the position House holds in the series. His defining professional identity is the hospital’s specialist in difficult diagnoses.