6A00.0

ICD-11 MMS 2026-01

Disorder of intellectual development, mild

Description

A mild disorder of intellectual development is a condition originating during the developmental period characterised by significantly below average intellectual functioning and adaptive behaviour that are approximately two to three standard deviations below the mean (approximately 0.1 – 2.3 percentile), based on appropriately normed, individually administered standardized tests or by comparable behavioural indicators when standardized testing is unavailable. Affected persons often exhibit difficulties in the acquisition and comprehension of complex language concepts and academic skills. Most master basic self-care, domestic, and practical activities. Persons affected by a mild disorder of intellectual development can generally achieve relatively independent living and employment as adults but may require appropriate support.

Coding note from above levels

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

Index terms

  • Disorder of intellectual development, mild
  • Mild mental retardation
  • mild mental handicap

Exclusions from above levels

  • http://id.who.int/icd/entity/546689346 – Dementia
  • QE62 – Uncomplicated bereavement
  • QE84 – Acute stress reaction

Sibling codes

  • 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

Foundation entity

Disorder of intellectual development, mild – http://id.who.int/icd/entity/1207960454

Part of: 6A00: Disorders of intellectual development › 06: Mental, behavioural or neurodevelopmental disorders