What is Gregory House’s primary hospital department in House M.D.?

Gregory House heads the Department of Diagnostic Medicine in House M.D.

The department specializes in solving illnesses that remain unexplained after ordinary examinations and tests. House and his rotating team of fellows use differential diagnosis, laboratory work, imaging, and sometimes risky treatments to identify the underlying disease. This structure supplies the show’s weekly medical mystery.

House’s work is distinct from the hospital’s other departments. He may consult neurologists, surgeons, immunologists, or infectious-disease specialists, but his team’s central job is to connect seemingly unrelated symptoms into one diagnosis. The department is therefore the professional home of the title character.

House is also associated with nephrology and infectious disease, his stated medical specialties. Those fields explain parts of his expertise, but they do not replace Diagnostic Medicine as his hospital department. Emergency Medicine, Pediatrics, and Cardiothoracic Surgery are separate specialties represented elsewhere in the hospital.