H40.221 Chronic angle-closure glaucoma, right eye

Name of the Condition

• Chronic Angle-Closure Glaucoma, Right Eye

Summary

Chronic angle-closure glaucoma is an eye condition where the drainage angle of the eye becomes partially blocked over time, leading to increased intraocular pressure and potential optic nerve damage. In this case, it affects the right eye, and the stage is unspecified, meaning the progression may vary but requires monitoring for gradual vision loss if untreated.

Causes

The condition typically arises from anatomical factors, such as a naturally narrow drainage angle or age-related changes like lens thickening, which reduce the space between the iris and cornea. It may also develop as a complication of other eye conditions or trauma.

Risk Factors

• Older age (typically over 40).
• Family history of glaucoma.
• Asian or Inuit descent.
• Farsightedness (hyperopia).
• Certain medications that dilate the pupil.

Symptoms

• Blurred vision.
• Halos around lights.
• Mild eye pain or headaches.
• Gradual loss of peripheral vision.
• In advanced stages, tunnel vision may occur.

Diagnosis

Diagnosis involves a comprehensive eye exam, including tonometry to measure intraocular pressure, gonioscopy to assess the drainage angle, and optical coherence tomography (OCT) to evaluate optic nerve health. Visual field tests may also be used to detect peripheral vision loss.

Treatment Options

Treatment may include medications to lower intraocular pressure, laser therapy to improve drainage, or surgery to create a new drainage pathway. The choice depends on the severity and progression of the condition.

Prognosis and Follow-Up

With proper management, vision loss can be slowed or prevented. Regular follow-up appointments are essential to monitor intraocular pressure and optic nerve health, as the condition may progress gradually.

Complications

Untreated chronic angle-closure glaucoma can lead to permanent vision loss, including blindness. Other complications may include optic nerve damage and reduced quality of life due to visual impairment.

Lifestyle & Prevention

• Avoid medications that dilate the pupil without consulting a healthcare provider.
• Maintain regular eye exams, especially if risk factors are present.
• Manage overall health to reduce systemic risks that may affect eye pressure.

When to Seek Professional Help

Seek immediate care if experiencing sudden severe eye pain, vision loss, or halos around lights, as these may indicate acute angle-closure glaucoma, a medical emergency.

Tips for Medical Coders

Document the affected eye (right eye) and specify if the stage is known or unspecified. Ensure clinical notes support the diagnosis and any associated treatments or complications. Use this code for chronic angle-closure glaucoma affecting the right eye when the stage is not further specified.