Dennis Schroder added 15 for the Hawks, who rallied from a 12-point deficit in the first half.
Atlanta is locked into the eighth seed in the Eastern Conference playoffs and a first-round date with the Indiana Pacers. Scott started for forward Paul Millsap, who was rested to get ready for the postseason.
Brandon Knight scored 31 points to lead the Bucks, who finished an NBA-worst 15-67.
Milwaukee's dismal season is over, though there is more certainty about the team's future after the prospective new owners said they wanted to build a new arena in Milwaukee.