The NBA confirmed Grant's fine in an official press release on Thursday.
The incident occurred about midway through the fourth quarter of Philadelphia's 116-108 loss on Monday. It was a forgettable blemish for Grant in what has been an otherwise solid season for the second-year player.
Philadelphia has many problems right now, owning an 8-53 record, but Grant is performing well by 76ers standards. His shooting percentage has increased by nearly nine points this season, up to 44.0, and his playing time has increased.
After primarily coming off the bench as a rookie, Grant has started 34 games this season and has broken the 30-minute barrier in each of his last three appearances as Jahlil Okafor continues to nurse an injured shin.
The 76ers are in full evaluation mode right now, trying to determine which players will stick around as they look to climb out of the cellar at some point in the near future. Grant's play of late warrants strong consideration, but he can't get caught up in moments like he had on Monday.
Grant, who is still just 21 years old, will take this moment as a learning opportunity and mature as he moves forward.