Reference: OCD was removed from the anxiety disorders chapter.
“In the DSM-5 (American Psychiatric Association 2013), OCD is newly classified into the diagnostic categories: “obsessive compulsive and related disorders” including “obsessive compulsive disorder”, and as related disorders e.g.“body dysmorphic disorder”, “hoarding disorder”, “hair pulling disorder” (trichotillomania). In the previous DSM-IV, OCD was classified as a subcategory of anxiety disorders. Therefore, in DSM-5, the specificity of the symptomatology including obsessions and compulsions with or without concomitant anxiety comes more to the center of attention.”
Brem, Silvia et al. “The neurobiological link between OCD and ADHD.” Attention deficit and hyperactivity disorders vol. 6,3 (2014): 175-202. doi:10.1007/s12402-014-0146-x