Pigmentary glaucoma, left eye, severe stage

This code signifies pigmentary glaucoma affecting the left eye, which has progressed to a severe stage. Pigmentary glaucoma is a secondary open-angle glaucoma characterized by pigment dispersion from the iris, leading to trabecular meshwork obstruction and elevated intraocular pressure, ultimately causing optic nerve damage and vision loss.

Apply this code when documentation clearly indicates a diagnosis of pigmentary glaucoma in the patient's left eye, and the severity is explicitly stated as "severe stage." This typically involves significant visual field loss, advanced optic nerve cupping, and/or poorly controlled intraocular pressure despite maximal medical therapy or prior surgical intervention.

• Ensure the laterality (left eye) is clearly documented.
• Verify the severity stage is explicitly stated as "severe" by the ophthalmologist. Do not assume severity.
• Code any associated complications, such as blindness or low vision, with additional codes.