What is Dr. House’s medical specialty at the start of House M.D.?

Dr. House’s specialty at the start of House M.D. is diagnostic medicine.

House leads a small Diagnostic Medicine team at Princeton-Plainsboro Teaching Hospital. The department investigates unusual or unexplained cases, often after patients have already been evaluated by other specialists. House’s team combines information from internal medicine, neurology, infectious disease, immunology, and other fields to identify a unifying diagnosis.

House is also described as board-certified in both infectious disease and nephrology. Those certifications are related to his clinical background, but “diagnostic medicine” is the specialty and department associated with his role in the series. This distinction prevents a common confusion: House is not primarily presented as a cardiologist, surgeon, or emergency physician.

The show’s structure turns diagnosis into a mystery-solving process. Symptoms are treated as clues, tests are used to eliminate possibilities, and the team revises its theories when new evidence appears. The drama exaggerates speed and autonomy compared with real hospital practice, but the specialty’s core purpose is accurately recognizable.