ICD-10 Code H40.812 – Glaucoma with increased episcleral venous pressure, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.812 – Glaucoma with increased episcleral venous pressure, left eye
What it is
This code identifies glaucoma in the left eye caused by increased episcleral venous pressure. It describes impaired aqueous outflow related to elevated venous pressure, not primary open-angle glaucoma.
Clinical signs
Findings may include raised intraocular pressure, optic nerve cupping, and visual field loss. Clinical features vary; refer to documentation for the specific cause of increased episcleral venous pressure.
When to use this code
Use H40.812 when the provider documents glaucoma in the left eye with increased episcleral venous pressure. Apply it when the record clearly links the glaucoma to that mechanism, such as a secondary form of glaucoma.
Do not infer laterality from a general glaucoma diagnosis. If the note only says glaucoma, or the pressure cause is not documented, check documentation before coding.
Do not use for
Do not use this code for unspecified glaucoma, primary glaucoma, or glaucoma in another eye. It is also not appropriate when increased episcleral venous pressure is not documented.
Coding tip
Confirm both the left-eye laterality and the documented pressure-related cause before assigning H40.812.