Anatomical narrow angle, bilateral

This code signifies a congenital or acquired anatomical configuration of the eye where the angle between the iris and cornea is acutely narrow in both eyes, predisposing to angle-closure glaucoma. This narrowness restricts the outflow of aqueous humor, increasing intraocular pressure.

Use this code when documentation explicitly states "anatomical narrow angle" or "occludable angle" affecting both eyes, without evidence of actual angle closure glaucoma. This diagnosis is often made during routine ophthalmic examinations, such as gonioscopy, which reveals the narrow angle configuration.

• Ensure documentation specifies "bilateral" involvement; otherwise, use the appropriate unilateral code.
• Do not confuse this with codes for angle-closure glaucoma (e.g., H40.2x), as this code represents a precursor condition, not active glaucoma.
• Look for terms like "occludable angle," "narrow anterior chamber angle," or "anatomically narrow drainage angle" in both eyes.