Embiid's hand gesture occurred with 17 seconds left in Monday's 129-112 win over the Atlanta Hawks. With time winding down, Atlanta's Kevin Huerter approached from behind Embiid and stole the ball, prompting Embiid to flash a middle finger at Huerter.
Embiid, who scored a career-high 49 points, later apologized for the gesture.
After the game, Embiid made a profane remark while discussing his comment from last week about being the best player in the world.
"Yeah, I believe I am. But when I made that statement, I didn't actually say that I was," he said. "I said that being with some of the best players in the world [at the All-Star Game], I proved myself. That's what I said. But yeah, f--- it. My bad. I do believe it."
The NBA said Embiid's fine was based on prior multiple violations of "acceptable on-court decorum."
Embiid flips off Huerter, apologizes after game
Joel Embiid gives Kevin Huerter the middle finger after Huerter steals the ball in the game's final moments, but Embiid regrets his actions after the game.