Dhoni had called umpire Richard Illingworth's decision to give Dwayne Smith lbw "horrible" during the post-match presentation, after Chennai Super Kings lost the Qualifier to Mumbai Indians by 25 runs at Wankhede Stadium.
Smith was adjudged lbw to a full toss from Lasith Malinga in the first over of the Super Kings chase, but replays indicated the ball was missing leg stump by a substantial margin.
Dhoni admitted the level 1 offence and accepted the sanction.
