EL CAJON, Calif. -- Former San Diego Padres first-round draft pick Matt Bush pleaded not guilty Wednesday to DUI and other charges.

Bush, 23, is also facing misdemeanor charges in a separate case for allegedly assaulting Granite Hills High School students during a lacrosse practice last Feb. 4.

A readiness conference in both cases is scheduled for July 21 at the El Cajon Courthouse.

Bush was not in court Wednesday, but his attorney, Gregory Daniels, told Judge Evan Kirvin that Bush had enrolled in a residential rehabilitation program as directed earlier by the court.

The defendant -- out of custody on $50,600 bail -- pleaded not guilty to driving under the influence, resisting arrest and two counts of vandalism in connection with a June 28 incident in which he backed into a parked car in Mission Valley.

In the Feb. 4 assault case, Bush is charged with four counts of misdemeanor battery. The Padres designated Bush for assignment the next day.

Bush, drafted as a pitcher-shortstop, was with the Toronto Blue Jays until a 23-year-old woman in Florida accused him of throwing a baseball past her head and banging on her car window to scare her in March.

Bush, the overall first pick in the 2004 Major League Baseball Draft out of Mission Bay High School, received a signing bonus of $3.15 million.