Fire Department spokesman Joe Roccasalva said Berry felt better and signed a release after being checked out. Roccasalva said the confusion arose because emergency personnel later responded to a patron at the show who was unwell.
Berry, 84, is known for his classic songs including "Maybelline," ''Johnny B. Goode," and "Roll Over Beethoven."
His agent Dick Alen said he had no information on the matter.
Concertgoer Steve Handwerker said Berry was giving an erratic, out-of-tune performance. While sitting at the keyboard, Handwerker said, Berry fell onto it face first and was helped offstage. He said he went outside and saw an ambulance at the back of the theater, but ran back inside when he heard the remaining crowd roar.
Berry, still in his performance outfit, was standing unassisted and seemed alert, Handwerker said. He said Berry thanked the crowd, said medics put on a blood pressure cuff, and patted his chest.
Saying he wanted to give fans what they wanted, Berry did a step or two of what he called his "heel scoop" move and was helped offstage. Handwerker said he later saw Berry get into a white limousine and ride away from the theater.