What medical specialty is Dr. House chiefly known for practicing in House M.D.?

Dr. House is chiefly known for practicing diagnostic medicine in House M.D.

House leads a specialized Diagnostic Medicine department at Princeton-Plainsboro Teaching Hospital. His team investigates patients whose symptoms do not fit an obvious diagnosis, often consulting other specialists and testing competing explanations.

Diagnostic medicine is presented in the series as a collaborative process, although House's methods are unusually aggressive and unconventional. The show dramatizes differential diagnosis as a mystery-solving exercise, compressing complex medical work into compelling television narratives.

House is also described as having expertise in nephrology and infectious disease, which can cause confusion when a question asks for his central department rather than his additional medical specialties. The broad answer for his role at the hospital is diagnostic medicine.