F51Nonorganic sleep disorders
Code usage status
Primary diagnosis
Select a more specific code
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Do not use F51 directly
Use the most specific code supported by the record.
- Chapter V
- Mental and behavioural disorders
- Official Vietnamese name
- Rối loạn giấc ngủ không thực tổn
- Additional WHO coding guidance
- In many cases, a disturbance of sleep is one of the symptoms of another disorder, either mental or physical. Whether a sleep disorder in a given patient is an independent condition or simply one of the features of another disorder classified elsewhere, either in this chapter or in others, should be determined on the basis of its clinical presentation and course as well as on the therapeutic considerations and priorities at the time of the consultation. Generally, if the sleep disorder is one of the major complaints and is perceived as a condition in itself, the present code should be used along with other pertinent diagnoses describing the psychopathology and pathophysiology involved in a given
Related F51 codes
F51.0
Primary diagnosis candidate
Nonorganic insomnia
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.
