ICD-10 Code H40.20 – Unspecified primary angle-closure glaucoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.20 – Unspecified primary angle-closure glaucoma
What it is
H40.20 identifies primary angle-closure glaucoma when the record does not specify the exact stage, laterality, or acute versus chronic form. Use it for angle-closure glaucoma documented as unspecified.
Clinical signs
Clinical features vary; refer to documentation. Findings may include narrow anterior chamber angle, elevated intraocular pressure, optic nerve damage, or glaucomatous visual field loss.
When to use this code
Use this code when the provider diagnoses primary angle-closure glaucoma but does not document a more specific subtype. It also fits when notes confirm angle closure without further detail. If the record later specifies the form or laterality, code the more specific option instead.
Do not use for
Do not use it for secondary angle-closure glaucoma, open-angle glaucoma, or glaucoma documented as acute or chronic when a more specific code is available. Check documentation.
Coding tip
Confirm that “primary angle-closure glaucoma” is explicitly stated before assigning H40.20.