ICD-11 classes
06 Mental, behavioural or neurodevelopmental disorders
Neurodevelopmental disorders
6A00 — Disorders of intellectual development

ICD-11 6A00 — Disorders of intellectual development

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.

The diagnosis includes nothing.

Diagnosis with code 6A00 contains 6 clarifying diagnoses:

1. 6A00.0 — Disorder of intellectual development, mild
2. 6A00.1 — Disorder of intellectual development, moderate
3. 6A00.2 — Disorder of intellectual development, severe
4. 6A00.3 — Disorder of intellectual development, profound
5. 6A00.4 — Disorder of intellectual development, provisional
6. 6A00.Z — Disorders of intellectual development, unspecified