Low-tension glaucoma, bilateral, severe stage

This code signifies a chronic optic neuropathy characterized by progressive visual field loss and optic nerve damage, despite intraocular pressure (IOP) consistently remaining within the statistically normal range (typically below 21 mmHg). It affects both eyes and has progressed to a severe stage, indicating extensive and irreversible damage to the optic nerve and significant visual impairment.

Apply this code when documentation confirms a diagnosis of low-tension glaucoma affecting both eyes, with clear evidence of severe stage disease based on visual field testing, optic disc examination, and/or OCT findings. This diagnosis requires ruling out other causes of optic neuropathy and confirming normal IOP measurements over time.

• Ensure documentation explicitly states "low-tension" or "normal-tension" glaucoma and specifies bilateral involvement.
• The "severe stage" must be clearly supported by clinical findings, such as extensive visual field defects or significant optic nerve cupping.
• Do not confuse with primary open-angle glaucoma (POAG) where IOP is elevated.