Primary angle closure without glaucoma damage, left eye

This code signifies a condition where the drainage angle of the left eye is anatomically narrow or closed, predisposing the eye to acute angle-closure glaucoma, but without any evidence of optic nerve damage or visual field loss typically associated with glaucoma. It represents a high-risk state for future glaucoma development.

Use this code for patients diagnosed with primary angle closure in the left eye, identified through gonioscopy or anterior segment OCT, where intraocular pressure may be elevated but no glaucomatous changes to the optic nerve or visual field have occurred. Documentation should clearly state "primary angle closure" and specify "left eye" without mention of glaucoma damage.

• Differentiate from codes indicating glaucoma damage (e.g., H40.1x) or secondary angle closure.
• Ensure laterality is accurately documented and coded; this code is specific to the left eye.
• Do not use if there is any evidence of optic nerve damage or visual field defects; in such cases, a glaucoma code would be more appropriate.