Gregory House’s medical specialty besides infectious disease is nephrology. Nephrology is the branch of medicine concerned with the kidneys, including kidney failure, electrolyte disorders, hypertension, and dialysis-related care.
The series presents House as a physician who leads a diagnostic team at Princeton-Plainsboro Teaching Hospital. His combined expertise in nephrology and infectious disease helps explain why he approaches unusual cases through physiology, laboratory evidence, and rare disease patterns rather than routine treatment alone.
Viewers sometimes identify House only as a diagnostician, but “diagnostician” describes his role in the hospital rather than his original specialty. The show’s fictional Diagnostic Medicine department draws on several fields, while House’s formal specialties are nephrology and infectious disease.