The classification of Obsessive-Compulsive and Related Disorders in the ICD-11

Area of Science:

• Psychiatry and Mental Health
• Clinical Psychology
• Neuroscience

Background:

• The Eleventh Revision of the World Health Organization's International Classification of Diseases and Related Health Problems (ICD-11) introduces a new grouping for Obsessive-Compulsive and Related Disorders (OCRD).
• This initiative aims to refine the classification and understanding of disorders characterized by repetitive unwanted thoughts and associated behaviors.
• The grouping's conceptualization and essential features are detailed within the ICD-11 framework.

Purpose of the Study:

• To present the rationale behind the new Obsessive-Compulsive and Related Disorders (OCRD) grouping in ICD-11.
• To outline the conceptualization and essential features of the disorders included in this new classification.
• To ensure clinical utility, global applicability, and scientific validity of the OCRD grouping.

Main Methods:

• Review of recommendations from the ICD-11 Working Group on the Classification for OCRD.
• Analysis of clinical features, imaging, neurochemical, and genetic studies supporting the grouping.
• Consideration of alternative nosological conceptualizations and their empirical basis.

Main Results:

• The OCRD grouping is based on shared clinical features like repetitive unwanted thoughts and behaviors.
• Included disorders comprise obsessive-compulsive disorder, body dysmorphic disorder, hypochondriasis, olfactory reference disorder, hoarding disorder, and body-focused repetitive behaviors (trichotillomania, excoriation disorder).
• Tourette disorder and personality disorder with anankastic features are recommended for cross-referencing.

Conclusions:

• The proposed ICD-11 OCRD grouping aims to enhance accurate identification and treatment of affected individuals.
• Further research is necessary to confirm the clinical utility and global applicability of the new diagnostic guidelines.
• The OCRD grouping is expected to advance research into the prevalence, assessment, and management of these disorders.