ICD-10 Code H40.23 – Intermittent angle-closure glaucoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.23 – Intermittent angle-closure glaucoma
What it is
H40.23 identifies intermittent angle-closure glaucoma, a form of glaucoma where the drainage angle closes in episodes rather than continuously. Use it when the chart documents recurrent, transient angle closure affecting intraocular fluid outflow.
Clinical signs
Clinical features may include episodic eye pain, blurred vision, halos around lights, headache, or nausea during attacks. The diagnosis is supported by evidence of intermittent angle narrowing or closure on eye examination.
When to use this code
Use this code when the provider documents intermittent or episodic angle-closure glaucoma, including recurrent attacks or angle closure that resolves between episodes. It may also apply when records describe a history of angle closure with ongoing intermittent findings. Check documentation if the note only says “glaucoma” or “narrow angles” without confirming angle closure.
Do not use for
Do not use H40.23 for open-angle glaucoma, primary angle-closure glaucoma without intermittent episodes, or suspected glaucoma without confirmation. If the record is unclear, check documentation.
Coding tip
Confirm that the provider documented intermittent angle closure, not just elevated eye pressure or glaucoma suspicion.