ICD-10 Code H40 – Glaucoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40 – Glaucoma
What it is
H40 identifies glaucoma, a group of eye disorders that damage the optic nerve and can reduce vision over time. It is used when documentation supports glaucoma but does not specify a more exact subtype.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include optic nerve damage, visual field loss, and elevated or abnormal intraocular pressure, though pressure may be normal in some cases.
When to use this code
Use H40 when the record states glaucoma without further detail, or when the provider documents glaucoma but does not identify the type, laterality, or stage. It may also apply when the note confirms glaucoma as the active diagnosis and no more specific code is available.
Do not use for
Do not use H40 for ocular hypertension without glaucoma, or for a more specific glaucoma type when documentation supports a narrower code. Check documentation if the diagnosis is uncertain.
Coding tip
Review the ophthalmology note for type, laterality, and stage before defaulting to H40.