Unspecified primary angle-closure glaucoma, severe stage

This code signifies a severe form of primary angle-closure glaucoma where the specific type (e.g., acute, chronic, intermittent) is not documented. It indicates significant, irreversible optic nerve damage and visual field loss due to elevated intraocular pressure from a closed anterior chamber angle.

Apply this code when the patient presents with advanced primary angle-closure glaucoma, characterized by severe visual field defects and optic nerve cupping, but the physician's documentation does not specify the exact clinical presentation of the angle closure. Documentation must clearly indicate "severe stage" or equivalent findings.

• Ensure documentation explicitly states "severe stage" or describes severe visual field loss and optic nerve damage.
• Do not use if the specific type of primary angle-closure glaucoma (e.g., acute, chronic) is documented; use a more specific code.
• Always sequence this code after any underlying systemic conditions contributing to the glaucoma, if applicable.