H91.9Hearing loss, unspecified
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 VIII
- Diseases of the ear and mastoid process
- Group H90-H95
- Other disorders of ear
- Official Vietnamese name
- Giảm thính lực, không xác định
- Additional WHO coding guidance
- Deafness: NOS high frequency low frequency
Related H91 codes
H91
Other hearing loss
H91.0
Primary diagnosis candidate
Ototoxic hearing loss
H91.1
Primary diagnosis candidate
Presbycusis
H91.2
Primary diagnosis candidate
Sudden idiopathic hearing loss
H91.3
Primary diagnosis candidate
Deaf mutism, not elsewhere classified
H91.8
Primary diagnosis candidate
Other specified hearing loss
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.
