JACKSONVILLE, Fla. (AP) — A central Florida ophthalmologist is being held without bail on charges of Medicare fraud after U.S. Magistrate Patricia Barksdale ruled Monday that he is a flight risk.

David Ming Pon, 56, is accused of submitting false bills and records to a Medicare billing center in Jacksonville. The Florida Times-Union reported Pon pleaded not guilty to 20 counts of health care fraud related to cases that occurred between 2006 and 2011 in Orlando and Leesburg.