ICD-10 Code H40.001 – Preglaucoma, unspecified, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.001 – Preglaucoma, unspecified, right eye
What it is
This code identifies pregaucoma in the right eye when the documentation does not specify the exact type. It indicates a glaucoma-suspect or early pressure-related eye finding that needs monitoring.
Clinical signs
Findings may include suspicious optic nerve changes, elevated intraocular pressure, or other features suggesting risk for glaucoma. Clinical features vary; refer to documentation.
When to use this code
Use H40.001 when the provider documents preglaucoma, glaucoma suspect, or an unspecified preglaucomatous condition limited to the right eye. Choose this code when laterality is clear but the subtype is not. Check documentation if the note instead confirms established glaucoma or another eye disorder.
Do not use for
Do not use this code for confirmed glaucoma, ocular hypertension without preglaucoma documentation, or left or bilateral eye findings. If the record names a different stage or type, code that condition instead.
Coding tip
Verify laterality and whether the provider means suspect, preglaucoma, or definite glaucoma before assigning H40.001.