Chronic angle-closure glaucoma, unsp eye, severe stage

This code signifies a chronic form of angle-closure glaucoma where the iris blocks the drainage angle, leading to increased intraocular pressure and optic nerve damage. The specific eye affected is not documented, and the condition has progressed to a severe stage, indicating significant vision loss or optic nerve damage.

Use this code when documentation confirms chronic angle-closure glaucoma without specifying laterality (e.g., "bilateral" or "right eye," "left eye") and explicitly states a severe stage. This typically applies when the physician notes advanced visual field defects, extensive optic nerve cupping, or severe vision impairment due to the glaucoma.

• Ensure the documentation clearly indicates "chronic" and "severe stage" for angle-closure glaucoma.
• Avoid using this code if laterality (right, left, or bilateral) is specified; instead, select the appropriate H40.22x1, H40.22x2, or H40.22x3 code.
• Do not confuse with acute angle-closure glaucoma (H40.21x) or other types of glaucoma.