House M.D.'s title character is primarily a specialist in which medical field?

House M.D.'s title character is primarily a specialist in diagnostic medicine. Gregory House leads a team that investigates complex cases when ordinary testing and treatment have failed.

Diagnostic medicine in the series is presented as a hospital-based discipline focused on identifying difficult or unusual illnesses. House's team combines evidence from examinations, laboratory results, imaging and patient histories. The show dramatizes this process as a puzzle, although its compressed timelines and unusual cases are not a complete picture of real clinical practice.

House also has recognized expertise in infectious disease and nephrology. Those specialties help explain his knowledge of systemic illness and kidney-related conditions, but they do not replace his role as the head of the Diagnostic Medicine department. His team consults specialists when a case requires procedures or expertise outside the department.

A frequent mix-up is calling House a neurologist or surgeon. He is neither: the character is a diagnostician whose investigations may involve many branches of medicine.