ICD-10 Code H40.123 – Low-tension Glaucoma, Bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.123 – Low-tension glaucoma, bilateral
What it is
H40.123 identifies low-tension glaucoma affecting both eyes. It is a form of glaucoma in which optic nerve damage and visual field loss occur despite intraocular pressure that is not elevated.
Clinical signs
Typical findings include optic disc cupping, corresponding visual field defects, and a normal-range eye pressure. Clinical features vary; refer to documentation for laterality and confirmed diagnosis.
When to use this code
Use H40.123 when the provider documents bilateral low-tension glaucoma, also called normal-tension glaucoma. You should code it when both eyes are affected and the diagnosis is established in the record. If laterality is unclear, check documentation before assigning the code.
Do not use for
Do not use this code for ocular hypertension without glaucoma, or for glaucoma documented only in one eye. Check documentation if the note describes glaucoma suspect or another glaucoma type.
Coding tip
Confirm both the diagnosis and bilateral involvement in the assessment before coding H40.123.