VITiếng Việt
ICD-10 Vietnam

F84.2Rett syndrome

Code usage status

Primary diagnosis

May be used as the primary diagnosis

Apply only when it matches the confirmed diagnosis and the documented clinical record.

Specificity

Complete code in the classification

Use when the diagnosis matches and no exclusion applies.

Chapter V
Mental and behavioural disorders
Group F80-F89
Disorders of psychological development
Official Vietnamese name
Hội chứng Rett
Additional WHO coding guidance
A condition, so far found only in girls, in which apparently normal early development is followed by partial or complete loss of speech and of skills in locomotion and use of hands, together with deceleration in head growth, usually with an onset between seven and 24 months of age. Loss of purposive hand movements, hand- wringing stereotypies, and hyperventilation are characteristic. Social and play development are arrested but social interest tends to be maintained. Trunk ataxia and apraxia start to develop by age four years and choreoathetoid movements frequently follow. Severe mental retardation almost invariably results.

Related F84 codes

F84 Pervasive developmental disorders F84.0 Primary diagnosis candidate Childhood autism F84.1 Primary diagnosis candidate Atypical autism F84.3 Primary diagnosis candidate Other childhood disintegrative disorder F84.4 Primary diagnosis candidate Overactive disorder associated with mental retardation and stereotyped movements F84.5 Primary diagnosis candidate Hội chứng Asperger F84.8 Primary diagnosis candidate Other pervasive developmental disorders F84.9 Primary diagnosis candidate Pervasive developmental disorder, unspecified

Clinical record checklist

View coding guide →
  • Confirm that the code matches the final documented diagnosis.
  • Use one primary-diagnosis code and record only relevant additional conditions.
  • Review Ministry indicators, inclusions, exclusions and notes.
  • Do not infer a diagnosis beyond the clinical record.

2026 regulatory basis

Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.