ICD-10 Code H40.9 – Unspecified glaucoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.9 – Unspecified glaucoma
What it is
H40.9 identifies glaucoma when the record confirms glaucoma but does not specify the type, laterality, or stage. Use it for a documented glaucoma diagnosis with incomplete detail.
Clinical signs
Clinical features vary; refer to documentation. Glaucoma may be noted by optic nerve damage, visual field loss, or elevated intraocular pressure, but the chart must support the diagnosis.
When to use this code
Use H40.9 when the provider documents glaucoma and no more specific subtype is stated. It also fits cases where the note lacks enough detail to assign a more precise glaucoma code. Check documentation before defaulting to this unspecified code.
Do not use for
Do not use this code when the record identifies primary open-angle, angle-closure, secondary, or other specified glaucoma. Do not use it for ocular hypertension without a glaucoma diagnosis.
Coding tip
Query for the glaucoma type and laterality whenever the note says only “glaucoma.”