Acute angle-closure glaucoma, unspecified eye

This code signifies a sudden and severe increase in intraocular pressure (IOP) due to the blockage of aqueous humor outflow, specifically when the anatomical location of the affected eye is not documented. This condition is an ophthalmic emergency that can lead to rapid vision loss if not treated promptly.

Apply this code when the patient presents with symptoms and signs consistent with acute angle-closure glaucoma, and the medical record does not specify whether the right, left, or both eyes are affected. Documentation should clearly indicate an acute onset and the characteristic findings of angle-closure.

• Only use this code when laterality is truly unspecified in the medical record.
• Prioritize codes specifying laterality (H40.211, H40.212, H40.213) if documented.
• Do not confuse with chronic angle-closure glaucoma (H40.22-) or other types of glaucoma.