In House M.D., what is Gregory House’s medical specialty department called?

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

The department handles difficult cases that other physicians have not solved. House and his team gather clues, test competing explanations, and repeatedly revise their diagnoses as new symptoms or laboratory results appear.

The show turns diagnosis into its central dramatic structure. A typical episode begins with a mysterious illness, follows a series of hypotheses and tests, and ends when the team identifies a unifying explanation. The department is fictionalized, but its cases draw on real medical concepts and rare diseases.

House is also described as a specialist in nephrology and infectious disease. Those qualifications help explain his interest in systemic illness, organ failure, and unusual infections, but his administrative home at Princeton-Plainsboro is Diagnostic Medicine.