Danilo Gallinari had 32 as Denver took the lead from the line in the third quarter to beat the Suns for the second time this week 123-112.
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Eric Bledsoe added a career-high 41 points and Devin Booker scored 23 points for Phoenix.
Kenneth Faried had 21 points and 13 rebounds for the Nuggets, who have now won three straight and 7-of-9.
Denver won despite the absence of Nikola Jokic, out with a hip flexor strain.
The Nuggets had 19 free throws in the third quarter, and sunk 18 of them to secure the late lead and cruise in for the road win.