What are the names of the two medical specialties in which House is board-certified?

House is board-certified in infectious disease and nephrology.

These two specialties are part of Gregory House’s professional background in House M.D. Infectious disease concerns illnesses caused by pathogens, while nephrology focuses on the kidneys and related disorders. Both fields support the character’s ability to reason through complicated systemic illnesses.

The series also depicts House as the head of Diagnostic Medicine, which is his hospital department rather than one of the two board certifications. That distinction explains why answers naming diagnostic medicine alone do not fully answer the question about his certifications.

House’s expertise is presented dramatically rather than as a complete account of real-world medical credentialing. The show uses his knowledge of infections, kidney function, toxins, and organ systems to build diagnostic puzzles, while his unconventional behavior supplies the interpersonal conflict.