Chronic angle-closure glaucoma, left eye, severe stage

This code signifies a chronic form of glaucoma where the iris blocks the drainage angle of the eye, leading to increased intraocular pressure and optic nerve damage, specifically affecting the left eye. The "severe stage" indicates significant and irreversible vision loss or optic nerve damage has occurred.

Use this code when documentation explicitly states chronic angle-closure glaucoma affecting the left eye, with a clear indication of severe stage disease. This diagnosis is typically supported by visual field defects, optic disc cupping, and gonioscopy findings consistent with angle closure and advanced damage.

• Ensure the documentation specifies "chronic" angle-closure glaucoma, not acute or subacute.
• Verify the affected eye (left) and the severity stage (severe) are clearly documented.
• Distinguish from open-angle glaucoma (H40.1x) and other types of glaucoma.