Attorney J. Michael Flanagan entered the plea for Belisario at his arraignment and scheduled a pretrial hearing for October.
The 26-year-old rookie right-hander was with the team in Colorado on Thursday completing a three-game series with the Rockies and did not appear in court.
He was arrested in Pasadena early on June 27 after California Highway Patrol officers said they saw him talking on his cell phone while driving and arrested him on suspicion of driving under the influence.
A Breathalyzer test showed Belisario had a blood-alcohol level of .13; he then took the test again with a result of .11, Flanagan said. The California limit is .08.
Belisario was released on $5,000 bail.
Flanagan said after the arraignment that Belisario was only checking his phone for messages at a stop sign and that he was wrongly pulled over.
"Things happen to everybody. You know they stopped me for no reason," Belisario said Thursday in Denver after the Dodgers' 3-2 win. "That doesn't effect me at all. I'm moving on."
A phone message left with the Pasadena city attorney's office was not immediately returned.
Dodgers spokesman Josh Rawitch declined comment, saying it is team policy not to discuss pending legal matters.
Belisario, from Venezuela, spent 10 years in the minors before becoming one of the Dodgers' most frequently used and effective relievers this season. He is 2-3 with an ERA of 2.30 in 51 appearances this season.