H50.4Other and unspecified heterotropia
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 VII
- Diseases of the eye and adnexa
- Official Vietnamese name
- Lác khác và/hoặc không xác định
- Additional WHO coding guidance
- (alternating)(monocular strabismus NOS Cyclotropia Microtropia Monofixation syndrome
Related H50 codes
H50
Other strabismus
H50.0
Primary diagnosis candidate
Convergent concomitant strabismus
H50.1
Primary diagnosis candidate
Divergent concomitant strabismus
H50.2
Primary diagnosis candidate
Vertical strabismus Hypertropia
H50.3
Primary diagnosis candidate
Intermittent heterotropia
H50.5
Primary diagnosis candidate
Heterophoria
H50.6
Primary diagnosis candidate
Mechanical strabismus
H50.8
Primary diagnosis candidate
Other specified strabismus
H50.9
Primary diagnosis candidate
Strabismus, 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.
