H40.231 Intermittent angle-closure glaucoma, right eye

Name of the Condition

• Intermittent Angle-Closure Glaucoma, Right Eye

Summary

Intermittent angle-closure glaucoma, right eye, is a form of glaucoma marked by periodic, temporary closure of the right eye's drainage angle, leading to episodic increases in intraocular pressure. These episodes may resolve spontaneously or require intervention, and the condition carries a risk of progressive optic nerve damage over time if not managed. The term "intermittent" reflects the recurring nature of the angle closure, while "right eye" specifies the laterality of the condition.

Causes

The condition stems from anatomical factors that predispose the right eye's drainage angle to intermittent blockage, such as a narrow angle or a thickened lens. Episodes may be triggered by factors like pupil dilation (e.g., in low light or with certain medications), which can temporarily worsen the angle closure. Underlying structural abnormalities in the right eye's anterior segment may also contribute.

Risk Factors

• Anatomically narrow drainage angles in the right eye.
• Farsightedness (hyperopia).
• Age over 40.
• Family history of glaucoma.
• Asian or Inuit descent.
• Pupil-dilating medications or conditions.

Symptoms

• Episodic eye pain or discomfort in the right eye.
• Blurred vision during attacks.
• Halos around lights.
• Headaches.
• Nausea (in acute episodes).
• Gradual peripheral vision loss over time.

Diagnosis

Diagnosis requires a comprehensive eye exam of the right eye, including tonometry to measure intraocular pressure, gonioscopy to assess the drainage angle, and optical coherence tomography to evaluate optic nerve and anterior segment structures. The episodic nature of the condition may necessitate repeated assessments to confirm intermittent closure.

Treatment Options

Treatment focuses on preventing acute episodes and managing chronic risk. Acute attacks may require medications (e.g., topical or systemic agents to lower intraocular pressure) or laser iridotomy. Long-term management often includes laser or surgical procedures to create a permanent opening in the iris, reducing the risk of future angle closure. Regular monitoring is essential to detect progression.

Prognosis and Follow-Up

With appropriate management, prognosis is generally favorable, but untreated or poorly controlled episodes can lead to permanent vision loss. Follow-up care involves regular eye exams to monitor intraocular pressure, optic nerve health, and visual field changes. Patients should be educated on recognizing symptoms of acute attacks and the importance of adherence to treatment.

Complications

Potential complications include permanent optic nerve damage, chronic angle closure, and vision loss. Acute episodes can lead to corneal edema, nausea, or systemic symptoms. Recurrent episodes may increase the risk of developing chronic glaucoma, requiring ongoing intervention.

Lifestyle & Prevention

• Avoid triggers like low-light environments or medications that dilate the pupil without consulting a provider.
• Use proper lighting to reduce pupil dilation.
• Follow prescribed treatments consistently.
• Attend regular eye exams to monitor the condition.

When to Seek Professional Help

Seek immediate medical attention if experiencing severe eye pain, sudden vision loss, nausea, or headache, as these may indicate an acute angle-closure episode. Routine follow-up is necessary for ongoing management and to address any changes in symptoms or vision.

Tips for Medical Coders

Document the laterality (right eye) and the intermittent nature of the angle closure. Ensure clinical notes support the episodic nature of the condition and any interventions performed. Code H40.231 is specific to the right eye; laterality must be clearly documented to justify the assignment.