Acute angle-closure glaucoma, bilateral

This code signifies a sudden and severe form of glaucoma affecting both eyes, characterized by a rapid increase in intraocular pressure due to the blockage of aqueous humor outflow. This blockage occurs when the iris bulges forward, narrowing or closing the anterior chamber angle. It is an ophthalmic emergency requiring prompt intervention to prevent irreversible vision loss.

Use this code when documentation clearly indicates an acute presentation of angle-closure glaucoma impacting both the right and left eyes. Supporting documentation should include findings such as sudden onset of eye pain, blurred vision, halos around lights, nausea/vomiting, and elevated intraocular pressure measurements in both eyes, along with gonioscopic evidence of angle closure.

• Ensure the documentation specifies "acute" and "bilateral" to accurately assign this code. Do not use for chronic or subacute forms.
• Distinguish carefully from primary open-angle glaucoma (H40.1x) or secondary glaucomas, which have different underlying etiologies.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, especially in emergency or urgent care settings.