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ICD-11 Psychiatry

Chapter 6 codes for mental, behavioural or neurodevelopmental disorders, and how ICD-11 differs from DSM-5-TR.

How codes work

Codes by group

Chapter 6 as arranged in ICD-11, from the WHO ICD-11 API, ICD-11 MMS 2026-01 release [1]. Red: other specified or unspecified. Grey: listed here, coded elsewhere.

ICD-11 vs DSM-5-TR: key differences

TopicICD-11DSM-5-TR
Diagnostic styleEssential features described in prose; few fixed symptom counts or cut-offs [2]Operational criteria, mostly with set symptom counts and durations [3]
Schizophrenia durationSymptoms for at least 1 month [2]At least 6 months of disturbance, including 1 month of active symptoms [3]
Brief psychosisAcute and transient psychotic disorder: lasts no more than 3 months [2]Brief psychotic disorder: at least 1 day, less than 1 month [3]
Mixed depression and anxietyOwn diagnosis, 6A73 [1,2]No diagnosis; "with anxious distress" specifier [3]
Chronic irritability in childrenOppositional defiant disorder with chronic irritability-anger, 6C90.0 [1,2]Disruptive mood dysregulation disorder, a depressive disorder [3]
HypochondriasisAn obsessive-compulsive or related disorder, 6B23 [1]Illness anxiety disorder or somatic symptom disorder [3]
Olfactory reference disorderOwn diagnosis, 6B22 [1]Only an example of other specified obsessive-compulsive and related disorder [3]
PTSDThree core elements: re-experiencing in the present, avoidance, persistent sense of current threat [2]20 symptoms in 4 clusters, including negative changes in mood and cognition [3]
Complex PTSDOwn diagnosis, 6B41: PTSD plus problems with affect regulation, self-concept and relationships [1,2]No diagnosis [3]
Prolonged grief disorderAt least 6 months after the death [2]At least 12 months after the death; 6 months in children and adolescents [3]
Distressing bodily symptomsBodily distress disorder, 6C20 [1]Somatic symptom disorder [3]
Substance useSeparate diagnoses: episode of harmful use, harmful pattern of use, dependence. Dependence needs 2 of 3 features, usually over 12 months, or 3 months if use is daily or almost daily [1,2]One substance use disorder: 2 or more of 11 criteria in 12 months, graded mild, moderate or severe [3]
GamingGaming disorder, 6C51 [1]Internet gaming disorder, only a condition for further study [3]
Compulsive sexual behaviourOwn diagnosis, 6C72, an impulse control disorder [1]No diagnosis [3]
Personality disordersOne diagnosis graded mild, moderate or severe (6D10), with optional trait qualifiers and borderline pattern (6D11) [1,2]10 named personality disorders in 3 clusters; dimensional model only as an alternative in Section III [3]
Sleep-wake disordersOwn chapter, outside mental disorders [1]Included among mental disorders [3]
GenderGender incongruence, in Conditions related to sexual health; not a mental disorder [1]Gender dysphoria, a mental disorder [3]

References

  1. World Health Organization. International Classification of Diseases, 11th Revision, for Mortality and Morbidity Statistics (ICD-11 MMS), 2026-01 release. World Health Organization; 2026.
  2. World Health Organization. Clinical Descriptions and Diagnostic Requirements for ICD-11 Mental, Behavioural or Neurodevelopmental Disorders (CDDR). World Health Organization; 2024.
  3. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed., text revision (DSM-5-TR). American Psychiatric Association Publishing; 2022.