ICD-10 Code H40.11 – Primary open-angle glaucoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.11 – Primary open-angle glaucoma
What it is
Primary open-angle glaucoma is a chronic eye disease that damages the optic nerve, usually with an open anterior chamber angle. It is commonly associated with gradual vision loss and may progress without symptoms.
Clinical signs
Clinical features vary; refer to documentation. Common findings include characteristic optic nerve cupping, visual field loss, and elevated intraocular pressure, though pressure may be normal in some cases.
When to use this code
Use this code when the record documents primary open-angle glaucoma as the diagnosis, including suspected progression or ongoing management of the condition. Code it when the provider identifies the disease as open-angle and not due to another eye disorder. If the note only states glaucoma without type, check documentation.
Do not use for
Do not use this code for angle-closure, secondary, or traumatic glaucoma. Also avoid it when the chart does not clearly specify primary open-angle glaucoma.
Coding tip
Confirm laterality, stage, and any documented severity details in the chart before assigning the final code.