Which medical specialty does House M.D.’s Gregory House lead: nephrology or diagnostic medicine?

Gregory House leads the Department of Diagnostic Medicine in House M.D. The department investigates puzzling cases that other hospital services have not successfully diagnosed.

The fictional department is the series’ central workplace. House assembles a small team of physicians, assigns them competing hypotheses, and uses tests, patient history, and clinical reasoning to identify the underlying illness. The show presents diagnosis as a collaborative but highly adversarial process, with House often overriding conventional hospital procedures.

House’s own medical specialty is also connected to nephrology and infectious disease. He is described as board-certified in infectious disease and nephrology, and his expertise in those fields informs many cases. However, the department he leads is Diagnostic Medicine, which is the answer to the question about his leadership role.

This distinction matters because nephrology concerns the kidneys, while diagnostic medicine in the show functions as a broad investigative specialty. Cardiology and neurology are separate medical fields that appear in cases but are not House’s department. The department’s fictional structure was created to support the program’s mystery format rather than reproduce a standard hospital organization exactly.