ICD-10 Code H40.12 – Low-tension Glaucoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.12 – Low-tension glaucoma
What it is
This code identifies low-tension glaucoma, a form of glaucoma where optic nerve damage occurs even though eye pressure is not elevated. You use it when documentation specifically states low-tension or normal-tension glaucoma.
Clinical signs
Typical findings include optic nerve cupping, visual field loss, and a glaucomatous pattern on eye examination. Clinical features vary; refer to documentation.
When to use this code
Use H40.12 when the provider diagnoses low-tension glaucoma and the record supports that exact condition. It may appear in ophthalmology notes, problem lists, or follow-up visits for established disease. Do not infer it from eye pressure alone.
Do not use for
Do not use this code for ocular hypertension, glaucoma suspect, or other glaucoma types unless the note confirms low-tension glaucoma. Check documentation if the subtype is unclear.
Coding tip
Code the documented glaucoma subtype exactly; if the chart says only “glaucoma,” query for clarification.