ICD-10 Code H40.2 – Primary angle-closure glaucoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.2 – Primary angle-closure glaucoma
What it is
H40.2 identifies primary angle-closure glaucoma, a type of glaucoma caused by blockage of aqueous outflow when the anterior chamber angle is narrow or closed. Use it when documentation specifies primary angle closure, with or without glaucoma damage.
Clinical signs
Typical findings include a narrow or closed anterior chamber angle, elevated intraocular pressure, and optic nerve or visual field changes when glaucoma is present. Clinical features vary; refer to documentation.
When to use this code
Use H40.2 when the provider documents primary angle-closure glaucoma, including chronic or established disease. It may also apply when angle-closure glaucoma is named without another more specific subtype. Check documentation if the record only notes narrow angles or suspected glaucoma.
Do not use for
Do not use this code for secondary angle-closure glaucoma or for open-angle glaucoma. If the chart describes ocular hypertension, narrow angles, or glaucoma suspect only, check documentation before coding H40.2.
Coding tip
Code the most specific angle-closure glaucoma type documented, and confirm laterality or stage only if the record supports it.