Embiid was ruled out for the rest of the Sixers' 118-101 victory with a facial contusion. While the 76ers initially said the All-Star center went through concussion protocol but did not have a concussion, they said after the game that he was taken to a hospital for additional testing.
Embiid posted an Instagram story that showed him in a hospital room and captioned it "Not good."
Preliminary X-rays revealed no fractures.
"I was scared,'' teammate Dario Saric said of his reaction to Embiid going down. "I hope he'll be good and he'll be ready.''
Fultz was driving toward the basket 20 seconds into the period when he appeared to accidentally head-butt Embiid. The 7-footer immediately went to the floor. He remained on the court for several minutes before finally being assisted by Philadelphia's trainer. Embiid sat up once before lying back down on the court. Eventually, he was helped off the court.
Fultz was not injured on the play.
"I know I hit him, but I believe he is OK,'' Fultz said. "My heart dropped. He's a tough guy. All I can do is pray for him.''
Embiid finished with 5 points and 3 rebounds in 8 minutes.
Information from The Associated Press was used in this report.