Disorders of intellectual development

Description

Disorders of intellectual development are a group of etiologically diverse conditions originating during the developmental period characterised by significantly below average intellectual functioning and adaptive behaviour that are approximately two or more standard deviations below the mean (approximately less than the 2.3rd percentile), based on appropriately normed, individually administered standardized tests. Where appropriately normed and standardized tests are not available, diagnosis of disorders of intellectual development requires greater reliance on clinical judgment based on appropriate assessment of comparable behavioural indicators.

Coding note

Use additional code, if desired, to identify any known aetiology.

Excludes

http://id.who.int/icd/entity/546689346 – Dementia

Exclusions from above levels

QE62 – Uncomplicated bereavement
QE84 – Acute stress reaction

Child codes

6A00.0 – Disorder of intellectual development, mild
6A00.1 – Disorder of intellectual development, moderate
6A00.2 – Disorder of intellectual development, severe
6A00.3 – Disorder of intellectual development, profound
6A00.4 – Disorder of intellectual development, provisional
6A00.Z – Disorders of intellectual development, unspecified

Sibling codes

6A01 – Developmental speech or language disorders
6A02 – Autism spectrum disorder
6A03 – Developmental learning disorder
6A04 – Developmental motor coordination disorder
6A05 – Attention deficit hyperactivity disorder
6A06 – Stereotyped movement disorder
6A0Y – Other specified neurodevelopmental disorders
6A0Z – Neurodevelopmental disorders, unspecified

Foundation entity

Disorders of intellectual development – http://id.who.int/icd/entity/605267007

Part of: 06: Mental, behavioural or neurodevelopmental disorders