The 2005 House M.D. episode that uses three patients to explore a diagnostic lesson is “Three Stories.” It is the 21st episode of the show’s first season and was written by David Shore.
The episode presents House teaching medical students about diagnosis through three apparently separate patient cases. Its structure moves between the classroom and flashbacks, gradually revealing that the cases are connected to House’s own medical history. The storytelling emphasizes differential diagnosis, uncertainty, and the danger of relying on an attractive but incorrect explanation.
“Three Stories” is widely regarded as one of the series’ landmark episodes. It won the Primetime Emmy Award for Outstanding Writing for a Drama Series, making Shore the first writer from House M.D. to win that award. The title refers to the three case narratives, not three seasons or three members of House’s permanent team.