Kahil Gray has autism and trouble expressing himself, according to his family. He was last seen at Chicago's Comer Children's Hospital on Tuesday.
"He just turned and run through a door. And we haven't seen him since," said Michael Gray, father.
Footage from hospital video cameras shows the boy leaving the building near 57 th Street and Cottage Grove, heading toward Cottage Grove, around 3:30 p.m. Tuesday.
Searchers have been out canvassing the area with flyers of the missing boy. His family says Gray will respond to his name, Kahil.
"I'm appealing to everyone in the surrounding area to help us find him," said Beryl Gray, mother. "Please bring him home to us. We love him. He is hungry right now. He is tired. He is weary. He wants to come home to his parents."
At the time of his disappearance, Gray was wearing a white shirt with blue stripes and light blue jeans. He is 5'6", 130 pounds and lives near 92nd and Stony Island Avenue. He walks with a quick pace, his parents say, and swings his arms.
The teen can speak only a few words, according to his father. Anyone with information regarding Gray's whereabouts is asked to call the police.