ICD-10 Code H54.42A – Blindness, left eye, category 3-5 (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H54.42A – Blindness, left eye, category 3-5
What it is
This code identifies blindness in the left eye with visual loss in category 3, 4, or 5. Use it when documentation specifies severe visual impairment or blindness limited to the left eye.
Clinical signs
Clinical features vary; refer to documentation. Findings may include markedly reduced or absent vision in the left eye, with the right eye not necessarily affected.
When to use this code
Use this code when the record clearly states blindness of the left eye and the visual category is 3, 4, or 5. It is appropriate for unilateral blindness due to documented ocular disease, injury, or another confirmed cause. If the note is unclear, check documentation.
Do not use for
Do not use this code for bilateral blindness, low vision without blindness, or left-eye impairment that is not documented as category 3-5. Do not assume severity from a general vision complaint.
Coding tip
Confirm laterality and visual category in the source note before assigning H54.42A.