What department does Dr. Gregory House lead in House M.D.?

In House M.D., Dr. Gregory House leads the Department of Diagnostic Medicine at Princeton-Plainsboro Teaching Hospital.

The department handles unusual cases that other doctors have been unable to diagnose. House works with a small team of fellows, using differential diagnosis to compare possible explanations for a patient’s symptoms. The show dramatizes this process through team discussions, tests, changing hypotheses, and occasional disagreements with hospital administrators.

Diagnostic medicine is distinct from a single organ-based specialty such as cardiology or neurology. House is portrayed as having expertise across multiple fields, which allows him to connect clues that may appear unrelated. His department’s cases are often rare or atypical, making the diagnostic team central to the series’ mystery structure.

Viewers sometimes identify the department simply as “diagnostics,” which is an informal shortening rather than the full name used in the series. Princeton-Plainsboro itself is fictional, despite the show borrowing realistic medical terminology and procedures. The department’s prominence also helped make the phrase “differential diagnosis” familiar to a broad television audience.