F98.5Stuttering [stammering]
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 F90-F98
- Behavioural and emotional disorders with onset usually occurring in childhood and adolescence
- Official Vietnamese name
- Tật nói lắp [nói cà lăm]
- Additional WHO coding guidance
- Speech that is characterized by frequent repetition or prolongation of sounds or syllables or words, or by frequent hesitations or pauses that disrupt the rhythmic flow of speech. It should be classified as a disorder only if its severity is such as to markedly disturb the fluency of speech. Excl.: cluttering (F98.6) tic disorders (F95.-)
Related F98 codes
F98
Other behavioural and emotional disorders with onset usually occurring in childhood and adolescence
F98.0
Primary diagnosis candidate
Nonorganic enuresis
F98.1
Primary diagnosis candidate
Nonorganic encopresis
F98.2
Primary diagnosis candidate
Feeding disorder of infancy and childhood
F98.3
Primary diagnosis candidate
Pica of infancy and childhood
F98.4
Primary diagnosis candidate
Stereotyped movement disorders
F98.6
Primary diagnosis candidate
Cluttering
F98.8
Primary diagnosis candidate
Other specified behavioural and emotional disorders with onset usually occurring in childhood and adolescence
F98.9
Primary diagnosis candidate
Unspecified behavioural and emotional disorders with onset usually occurring in childhood and adolescence
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.
