Irritability in child and adolescent psychopathology: An integrative review for ICD-11

- Severe irritability in youth poses a significant challenge for assessment and diagnosis.
- The development of ICD-11 aims to improve the diagnostic classification of youth irritability.
- To this end, we first review the literature on severe mood dysregulation and DMDD.
- Second, we summarize the research on the irritable dimension of ODD symptoms.
- Based on the evidence, we recommend a subtype, ODD with chronic irritability-anger, for ICD-11.

In preparation for the World Health Organization's development of the Eleventh Revision of the International Classification of Diseases and Related Health Problems (ICD-11) chapter on Mental and Behavioral Disorders, this article reviews the literature pertaining to severe irritability in child and adolescent psychopathology. First, research on severe mood dysregulation suggests that youth with irritability and temper outbursts, among other features of hyperactivity and arousal, demonstrate cross-sectional correlates and developmental outcomes that distinguish them from youth with bipolar disorder. Second, other evidence points to an irritable dimension of Oppositional Defiant Disorder symptomatology, which is uniquely associated with concurrent and subsequent internalizing problems. In contrast to the Diagnostic and Statistical Manual of Mental Disorders' (5th ed.) Disruptive Mood Dysregulation Disorder, our review of the literature supports a different solution: a subtype, Oppositional Defiant Disorder with chronic irritability/anger (proposal included in Appendix). This solution is more consistent with the available evidence and is a better fit with global public health considerations such as harm/benefit potential, clinical utility, and cross-cultural applicability. Implications for assessment, treatment, and research are discussed.