No airdate for Season 0
Season 1 of Doogie Howser, M.D. premiered on Sep 19, 1989
Season 2 of Doogie Howser, M.D. premiered on Sep 12, 1990
Season 3 of Doogie Howser, M.D. premiered on Sep 25, 1991
Season 4 of Doogie Howser, M.D. premiered on Sep 23, 1992