H74.9Disorder of middle ear and mastoid, 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 H65-H75
- Diseases of middle ear and mastoid
- Official Vietnamese name
- Rối loạn tai giữa và/hoặc xương chũm, không xác định
Related H74 codes
H74
Other disorders of middle ear and mastoid
H74.0
Primary diagnosis candidate
Tympanosclerosis
H74.1
Primary diagnosis candidate
Adhesive middle ear disease
H74.2
Primary diagnosis candidate
Discontinuity and dislocation of ear ossicles
H74.3
Primary diagnosis candidate
Other acquired abnormalities of ear ossicles
H74.4
Primary diagnosis candidate
Polyp of middle ear
H74.8
Primary diagnosis candidate
Other specified disorders of middle ear and mastoid
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.
