Preston lost ground on the play-off places after Birmingham came from behind to earn a 1-1 draw at Deepdale.
Sam Gallagher capitalised on a defensive mix-up to earn Birmingham a point after Ben Davies had put Preston ahead in the first half.
North End have now won just one of their last six matches, including four draws to sit four points off the play-off spots.
Birmingham remain inside the Championship relegation zone, but have lost only once in their last four league games.
Sam Gallagher had an opening...