Acute angle-closure glaucoma, right eye

This code signifies a sudden and severe increase in intraocular pressure (IOP) in the right eye, caused by the iris blocking the drainage angle of the anterior chamber. This acute blockage prevents aqueous humor outflow, leading to rapid vision loss and ocular pain. It is a medical emergency requiring immediate intervention.

Apply this code when documentation clearly indicates an acute onset of angle-closure glaucoma affecting the patient's right eye. Supporting documentation should detail symptoms such as sudden eye pain, blurred vision, halos around lights, and a significantly elevated IOP measurement in the right eye. This diagnosis is often confirmed by gonioscopy showing a closed or occluded anterior chamber angle.

• Ensure laterality is explicitly documented as "right eye" to support this specific code.
• Distinguish from chronic angle-closure glaucoma, which has different ICD-10-CM codes.
• Do not use for secondary angle-closure glaucoma, which requires a code from the H40.5- category.