ICD-10 Code H40.231 – Intermittent angle-closure glaucoma, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.231 – Intermittent angle-closure glaucoma, right eye
What it is
H40.231 identifies intermittent angle-closure glaucoma affecting the right eye. It means the drainage angle closes on and off, causing episodic pressure buildup in the eye.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include intermittent eye pain, blurred vision, halos around lights, and a shallow anterior chamber during attacks.
When to use this code
Use this code when the provider documents intermittent angle-closure glaucoma in the right eye. It fits cases where the diagnosis is confirmed and laterality is clearly stated. If the record only says angle-closure glaucoma without laterality or intermittent status, Check documentation.
Do not use for
Do not use H40.231 for primary open-angle glaucoma, chronic angle-closure glaucoma, or unspecified glaucoma. It is also wrong when the right-eye involvement is not documented.
Coding tip
Always verify both the intermittent nature and right-eye laterality in the provider note before assigning H40.231.