Obsessive-Compulsive and Related Disorders (OCRD) is a newly presented category in ICD-11, which become independent of Neurotic, Stress-related and Somatoform Disorders (F4) in ICD-10. As OCRD in ICD-11 is harmonized with OCRD in DSM-5, Obsessive-Compulsive Disorder (OCD), Hoarding Disorder, Trichotillomania, Excoriation disorder, and Body Dysmorphic Disorder are categorized in it. In addition, Olfactory Reference Disorder, Hypochondriasis and Tourette Syndrome (secondary parenting with Diseases of the nervous system) are newly categorized in OCRD in ICD-11.
 OCRD is based on a concept of Obsessive-Compulsive Spectrum Disorder (OCSD) that speculated a pathological model focusing on compulsivity and impulsivity of OCD and included diseases with OCD-like compulsive behaviors into sole category. By categorizing these disorders in OCRD, development of biological investigation, clinical comprehension and novel treatment strategy are expected. Meanwhile, it remains still unclear about the boundary among the disorders in OCRD and other categories such as Neurodevelopmental Disorders, Anxiety Disorders and Psychotic Disorders. We should address this point when we use ICD-11 for diagnosis and treatment of the disorders in OCRD.
 Author's abstract