A Rikers Island captain and a correction officer were charged on Friday with assaulting a teenage inmate in a storage room where there were no video surveillance cameras, and then filing false paperwork to conceal their actions.

The 18-year-old inmate, Ambiorix Celedonio, had to be hospitalized after the beating, which left him bleeding from his forehead and lips and with other injuries.

The captain, Medzid Kolenovic, and the officer, Jean Destine, surrendered to the authorities and were released on their own recognizance after pleading not guilty in State Supreme Court in the Bronx, said the office of Robert T. Johnson, the Bronx district attorney. The Bronx prosecutor, whose office filed the charges, has jurisdiction over criminal matters at the Rikers jail complex.

The authorities said the episode occurred on Dec. 9, 2014, at the Robert N. Davoren Complex at Rikers. Mr. Celedonio was working at the mess hall when he and Captain Kolenovic began arguing. The captain then opened the door to a supply closet and invited the inmate to settle the matter, prosecutors said.