Primary open-angle glaucoma, left eye, severe stage

This code signifies a diagnosis of primary open-angle glaucoma affecting the left eye, where the disease has progressed to a severe stage. This condition is characterized by optic nerve damage and visual field loss due to elevated intraocular pressure, without an identifiable secondary cause. The severe stage indicates significant and irreversible vision impairment.

This code is appropriate when documentation confirms a diagnosis of primary open-angle glaucoma in the patient's left eye, and the ophthalmologist has explicitly staged the condition as severe. This typically involves extensive visual field defects, significant optic nerve cupping, and often high intraocular pressure that is difficult to control. Use when the medical record clearly indicates the laterality and the severity of the glaucoma.

• Always verify the laterality (left eye) and the specific stage (severe) from the ophthalmologist's documentation.
• Do not confuse with other types of glaucoma (e.g., secondary, normal tension) or different stages (mild, moderate, unspecified).
• Ensure supporting documentation includes visual field test results, optic nerve head evaluation, and intraocular pressure readings that justify the severe staging.