ICD-10 Code H40.221 – Chronic angle-closure glaucoma, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.221 – Chronic angle-closure glaucoma, right eye
What it is
Use this code for chronic angle-closure glaucoma affecting the right eye. It identifies a long-term glaucoma caused by impaired aqueous outflow from a narrowed or closed anterior chamber angle.
Clinical signs
Findings may include elevated intraocular pressure, optic nerve damage, and visual field loss. Clinical features vary; refer to documentation, especially when the record specifies chronic angle closure in the right eye.
When to use this code
Assign H40.221 when the provider documents chronic angle-closure glaucoma in the right eye. Use it for established disease, follow-up care, or ongoing management when the diagnosis is confirmed in the chart.
Code the laterality exactly as documented. If the note does not clearly state right eye involvement or the glaucoma type is uncertain, check documentation before coding.
Do not use for
Do not use this code for open-angle glaucoma, acute angle-closure glaucoma, or glaucoma without chronic angle-closure documentation. Check documentation if the record only says glaucoma or mentions both eyes.
Coding tip
Always verify both the glaucoma type and laterality; H40.221 is specific to chronic angle-closure glaucoma in the right eye.