Glen "Big Baby" Davis was just found guilty of swindling the NBA out of a ton of cash through the league's healthcare plan ... after authorities claim he accepted reimbursement for medical treatments he never received.
The U.S. Attorney's Office in the Southern District of New York announced the update in the case on Wednesday ... saying a jury determined the former Boston Celtics champion -- as well as fellow ex-NBAer Will Bynum -- were involved in a criminal scheme to defraud the NBA's Players' Health and Benefit Welfare Plan.