What is the name of House M.D.’s fictional specialty department?

House M.D.’s fictional specialty department is the Department of Diagnostic Medicine.

Gregory House heads this department at Princeton-Plainsboro Teaching Hospital. Its purpose is to investigate complex cases that other departments have been unable to diagnose. House’s fellows test hypotheses through examinations, laboratory work, imaging, and sometimes risky procedures.

Diagnostic medicine is a real area of medical practice, but the show dramatizes it as a highly concentrated hospital department built around one physician’s team. In real hospitals, difficult diagnoses generally involve collaboration across many specialties rather than a single diagnostician making nearly every major decision.

The department’s name distinguishes House’s team from established specialties such as neurology or cardiology. Its cases often move across several fields, which is why the team consults surgeons, immunologists, neurologists, and infectious-disease specialists. The department is central to the show’s mystery format and remains House’s professional base for most of the series.