Discussion:Are NPCs and creatures treated the same way in 4e?
From D&D Wiki
 Are NPCs and creatures treated the same way in 4e?
I've noticed that the 4e section essentially merges monsters and NPCs. Noname 12:43, 20 September 2008 (MDT)
 Dracomortis 20:00, 1 March 2009 (MST)
Yes. In 4e, NPCs really aren't differentiates from monsters at all, and as Noname said, they're both included under 4e Creatures on the Wiki.