What is the name of Gregory House’s diagnostic specialty in House M.D.?

Gregory House’s specialty in House M.D. is diagnostic medicine. He leads a team that investigates rare, complicated, or unexplained illnesses at Princeton-Plainsboro Teaching Hospital.

Diagnostic medicine is not presented as a conventional ward specialty in the same way as cardiology or pediatrics. Instead, House’s department acts as a consultation service for cases that other doctors cannot identify or treat successfully. The team uses laboratory tests, imaging, patient history, and sometimes risky hypotheses to reach a diagnosis.

House is also described as having expertise in infectious disease and nephrology. Those are important parts of his medical background, but they are not the name of the hospital department he leads in the series.

This distinction causes a common mix-up: House is not simply an infectious-disease doctor. His narrative role is the head of diagnostic medicine, making the department’s unusual cases the focus of the show.