ICD-10 Code H40.239 – Intermittent angle-closure glaucoma, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.239 – Intermittent angle-closure glaucoma, unspecified eye
What it is
This code identifies intermittent angle-closure glaucoma affecting an unspecified eye. It means the drainage angle closes in episodes, causing temporary blockage of aqueous outflow and intermittent pressure elevation.
Clinical signs
Clinical features vary; refer to documentation. Episodes may include eye pain, blurred vision, halos around lights, headache, or nausea, with signs of a shallow anterior chamber or narrow angle on exam.
When to use this code
Use H40.239 when the record clearly states intermittent angle-closure glaucoma but does not specify the right or left eye. It also fits when the provider documents episodic angle closure without a more specific laterality assignment. Check documentation if the note only says glaucoma or narrow angles.
Do not use for
Do not use this code for chronic angle-closure glaucoma, primary open-angle glaucoma, or a documented right or left eye code. If the chart does not confirm angle-closure glaucoma, choose a more accurate diagnosis.
Coding tip
Assign the unspecified-eye code only when laterality is not documented; otherwise, code the correct eye-specific option.