ICD-10 Code H40.122 – Low-tension glaucoma, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.122 – Low-tension glaucoma, left eye
What it is
This code identifies low-tension glaucoma affecting the left eye. It describes glaucomatous optic nerve damage and visual field loss occurring despite intraocular pressure that is not elevated.
Clinical signs
Typical findings include optic disc cupping, corresponding visual field defects, and open anterior chamber angles. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents low-tension or normal-tension glaucoma in the left eye. It is appropriate when the diagnosis is specific to the left eye and supported by ophthalmic assessment. If laterality is not stated, check documentation.
Do not use for
Do not use this code for glaucoma of the right eye, bilateral disease, or unspecified eye involvement. Also avoid it when the record only notes elevated eye pressure without a glaucoma diagnosis.
Coding tip
Verify laterality and the exact glaucoma type in the assessment, not just in test results or problem lists.