Miles Bridges has been fined $50,000 for aggressively throwing his mouthguard into the crowd, hitting a teenage girl.

The incident took place when Bridges was ejected from the Charlotte Hornets' play-in game loss against the Atlanta Hawks after receiving two quick technical fouls in the fourth quarter.

While being escorted back to the locker room, Bridges appeared to react to a fan taunting him over the barricade, turning and throwing his mouthguard in that direction, but it missed and hit a 16-year-old girl.

He apologised for his actions when speaking with post-game media, calling it "unacceptable" and asked to be put in touch with the teenage girl to make amends.

The $50,000 fine matches the largest league-issued fine this season, equalling the figure Markieff Morris was slugged with after his flagrant foul on Nikola Jokic sparked a mini-skirmish.

Other big fines this season include $40,000 for Jusuf Nurkic for grabbing a fan's cell phone and throwing it into the stands, and $35,000 for Malik Beasley for striking Portland Trail Blazer Drew Eubanks.