ICD-10 Code H40.112 – Primary open-angle glaucoma, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.112 – Primary open-angle glaucoma, left eye
What it is
This code identifies primary open-angle glaucoma affecting the left eye. It describes a chronic optic nerve disease with open anterior chamber angle and no secondary cause documented.
Clinical signs
Findings may include optic nerve cupping, visual field loss, and elevated or normal intraocular pressure. Clinical features vary; refer to documentation.
When to use this code
Use H40.112 when the provider documents primary open-angle glaucoma in the left eye only. Apply it for confirmed diagnoses, follow-up visits, or ongoing management when laterality is specified. If the record does not clearly identify the eye, check documentation before coding.
Do not use for
Do not use this code for glaucoma in the right eye, both eyes, or unspecified eye. Also avoid it when the glaucoma type is secondary, narrow-angle, or otherwise different.
Coding tip
Verify laterality and glaucoma type in the assessment, not just in test results or history.