F51.0Nonorganic insomnia
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
- Official Vietnamese name
- Mất ngủ không thực tổn
- Additional WHO coding guidance
- A condition of unsatisfactory quantity and/or quality of sleep, which persists for a considerable period of time, including difficulty falling asleep, difficulty staying asleep, or early final wakening. Insomnia is a common symptom of many mental and physical disorders, and should be classified here in addition to the basic disorder only if it dominates the clinical picture. Excl.: insomnia (organic) (G47.0)
Related F51 codes
F51
Nonorganic sleep disorders
F51.1
Primary diagnosis candidate
Nonorganic hypersomnia
F51.2
Primary diagnosis candidate
Nonorganic disorder of the sleep-wake schedule
F51.3
Primary diagnosis candidate
Sleepwalking [somnambulism]
F51.4
Primary diagnosis candidate
Sleep terrors [night terrors]
F51.5
Primary diagnosis candidate
Nightmares
F51.8
Primary diagnosis candidate
Other nonorganic sleep disorders
F51.9
Primary diagnosis candidate
Nonorganic sleep 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.
