The production code for the M*A*S*H finale “Goodbye, Farewell and Amen” was 9-B04. The code identifies the episode in the production system, separate from its season-and-episode position as season 11, episode 16.
The finale first aired on CBS on February 28, 1983, and ran as a feature-length television event. Alan Alda directed the episode and was one of eight credited writers. Its story follows the final days of the 4077th Mobile Army Surgical Hospital as the Korean War ends and the unit prepares to disband.
Viewers sometimes confuse 9-B04 with the episode’s broadcast number or airdate. The production code is an internal cataloging identifier, while “season 11, episode 16” describes its place in the series. The finale is also notable for its unusually long runtime and for closing the original series after 11 seasons.