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In DSM-IV (American Psychiatric Association 1994) and DSM-IV-TR (American Psychiatric Association 2000), obsessive-compulsive disorder (OCD) was characterized as an anxiety disorder. In DSM-5 (American Psychiatric Association 2013), OCD was moved to a new chapter, titled “Obsessive-Compulsive and Related Disorders,” together with associated disorders that were previously classified in other chapters (e.g., Somatoform Disorders; Impulse-Control Disorders Not Elsewhere Classified). Additionally, new disorders were added to the “Obsessive-Compulsive and Related Disorders” chapter, which now includes OCD, body dysmorphic disorder, hoarding disorder, trichotillomania (hair-pulling disorder), excoriation (skin-picking) disorder, substance/medication-induced obsessive-compulsive and related disorder, and obsessive-compulsive and related disorder due to another medical condition. The goal of this chapter is to review the “Obsessive-Compulsive and Related Disorders” chapter of DSM-5 and each of the disorders contained within this categorization.
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