ICD-10 Code H54.42A4 – Blindness left eye category 4, normal vision right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H54.42A4 – Blindness left eye category 4, normal vision right eye
What it is
This code identifies legal blindness in the left eye at visual acuity category 4, while the right eye has normal vision. Use it when documentation clearly states this asymmetric vision status.
Clinical signs
Findings typically show profound loss of vision in the left eye with preserved normal vision in the right eye. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record specifies blindness limited to the left eye and normal vision in the right eye. It is appropriate for ophthalmology notes, problem lists, and claims that document the exact laterality and vision category. If the chart does not state both details, check documentation.
Do not use for
Do not use it for bilateral blindness, unspecified visual loss, or left-eye blindness without category 4 documentation. Do not assign it if the right eye is also impaired.
Coding tip
Verify laterality and the exact vision category before coding; both must match the documentation.