Chronic angle-closure glaucoma, bilateral, severe stage

This code signifies a chronic form of glaucoma characterized by a physically obstructed or narrowed anterior chamber angle, leading to impaired aqueous humor outflow and elevated intraocular pressure. This specific diagnosis indicates that both eyes are affected and the disease has progressed to a severe stage, often associated with significant visual field loss and optic nerve damage.

Use this code when documentation clearly states a diagnosis of chronic angle-closure glaucoma affecting both eyes, and the severity is explicitly noted as "severe stage." This typically involves findings such as extensive optic nerve cupping, advanced visual field defects, and persistently high intraocular pressure despite treatment.

• Ensure documentation specifies "chronic" and "angle-closure" to differentiate from acute or open-angle forms.
• Verify that both eyes are affected ("bilateral") and the "severe stage" is clearly documented by the ophthalmologist.
• Do not confuse with H40.21- (acute angle-closure glaucoma) or codes for unspecified stages.