Anatomical narrow angle, right eye

This code describes a structural abnormality of the anterior chamber angle in the right eye, where the iris is positioned unusually close to the trabecular meshwork. This anatomical configuration predisposes the patient to angle-closure glaucoma due to potential obstruction of aqueous humor outflow. It indicates a narrow angle without evidence of actual angle closure or elevated intraocular pressure at the time of diagnosis.

Use this code when documentation specifies a narrow anterior chamber angle in the right eye, identified through gonioscopy or anterior segment OCT, without signs of acute or chronic angle closure glaucoma. This diagnosis is often made during routine ophthalmic examinations or when evaluating patients with risk factors for angle closure. Supporting documentation should clearly state "anatomical narrow angle" or "occludable angle" and specify the right eye.

• Differentiate from actual angle-closure glaucoma codes (H40.2x) which indicate elevated intraocular pressure or synechiae.
• Ensure laterality is explicitly documented and correctly assigned (right, left, bilateral, or unspecified).
• This code is for the anatomical predisposition and not for the active disease state of glaucoma.