ICD-10 Code H34.231 – Retinal artery branch occlusion, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H34.231 – Retinal artery branch occlusion, right eye
What it is
This code identifies a branch of the retinal artery blocked in the right eye, causing reduced blood flow to part of the retina. Use it when documentation specifies the right eye and branch artery involvement.
Clinical signs
Typical findings include sudden, painless vision loss or a localized visual field defect in the right eye. Clinical features vary; refer to documentation, and confirm the diagnosis is retinal artery branch occlusion rather than another retinal vascular disorder.
When to use this code
Use H34.231 when the provider documents branch retinal artery occlusion affecting the right eye, including cases described as partial retinal arterial blockage. It may appear in ophthalmology, emergency, or stroke-related evaluations when the eye laterality is clearly stated. Check documentation if the record only says retinal artery occlusion without branch or side.
Do not use for
Do not use this code for central retinal artery occlusion, left eye, or unspecified eye laterality. Also avoid it when the note describes retinal vein occlusion or another cause of visual loss.
Coding tip
Verify both the branch artery diagnosis and the right-eye laterality before assigning H34.231.