ICD-10 Code H40.0 – Glaucoma Suspect (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.0 – Glaucoma suspect
What it is
H40.0 identifies a patient who is being monitored because glaucoma is suspected, but the diagnosis is not yet confirmed. Use it for risk-based surveillance when optic nerve or pressure findings raise concern.
Clinical signs
Typical documentation may note suspicious optic disc cupping, elevated intraocular pressure, abnormal visual field testing, or a strong family history. Clinical features vary; refer to documentation.
When to use this code
Use H40.0 when the provider documents glaucoma suspect, ocular hypertension under observation, or concern for early glaucoma without confirmed disease. It also fits follow-up visits where testing is being repeated to clarify status. Do not guess the subtype if it is not stated.
Do not use for
Do not use this code for confirmed open-angle, angle-closure, or secondary glaucoma. If the chart shows established glaucoma or another eye disorder, code that condition instead.
Coding tip
Check the ophthalmology note for the exact wording “suspect” before assigning H40.0.