On July 9, 2018, Barton re-signed with the Nuggets. On October 20, 2018, in just the second game of the season, Barton injured his right hip on a reverse layup in the third quarter of Denver's 119–91 win over the Phoenix Suns. He was subsequently ruled out for five to six weeks after undergoing surgery on October 23. He missed longer than expected, returning to action on January 12, 2019, against the Suns after missing 38 games; in 16 minutes, he scored six points on 2-of-10 shooting. On February 28, he recorded 21 points and 13 rebounds in a 111–104 loss to the Utah Jazz.
