What was the name of House M.D.'s hospital department for rare diagnoses?

House M.D.'s rare-disease unit was called the Department of Diagnostic Medicine. Dr. Gregory House led this department at Princeton-Plainsboro Teaching Hospital and worked with a small team to investigate cases that other departments could not solve.

The department is fictional, but it reflects the real practice of diagnostic medicine: integrating symptoms, medical history, tests, imaging, and specialist knowledge to identify a disease. The program dramatizes that process by making each case resemble a puzzle.

In the early seasons, House's team is commonly described as a diagnostic team or fellows. The department's name becomes especially relevant when House is given formal responsibility within the hospital's structure.

The term should not be confused with emergency medicine, internal medicine, or clinical pathology. Those are real specialties or fields with different roles. The series' department is a fictional hospital division built around complex diagnostic consultations.