H40.219 Acute angle-closure glaucoma, unspecified eye

Name of the Condition

• Acute Angle-Closure Glaucoma, Unspecified Eye

Summary

Acute angle-closure glaucoma, unspecified eye, is a sudden, severe form of glaucoma characterized by rapid closure of the eye's drainage angle, leading to a rapid increase in intraocular pressure. This condition can cause significant pain, vision loss, and optic nerve damage if not treated promptly. It is a medical emergency requiring immediate intervention to prevent permanent vision impairment.

Causes

The primary cause is a sudden blockage of the eye's drainage angle, often due to anatomical factors such as a thickened or forward-positioned lens. This blockage prevents aqueous humor from draining, causing intraocular pressure to rise rapidly. Contributing factors may include pupil dilation, inflammation, or structural abnormalities in the eye's anterior segment.

Risk Factors

• Anatomically narrow drainage angles.
• Farsightedness (hyperopia).
• Age over 40.
• Family history of glaucoma.
• Asian or Inuit descent.
• Certain medications that dilate the pupil.
• Previous episodes of angle closure.

Symptoms

• Severe eye pain or headache.
• Blurred vision.
• Halos around lights.
• Nausea or vomiting.
• Redness in the eye.
• Sudden loss of vision.

Diagnosis

Diagnosis involves a comprehensive eye examination, including tonometry to measure intraocular pressure, gonioscopy to assess the drainage angle, and evaluation of optic nerve health. Additional tests may include visual field testing and anterior segment imaging to confirm the diagnosis and rule out other conditions.

Treatment Options

Treatment focuses on rapidly lowering intraocular pressure to prevent optic nerve damage. Initial interventions may include medications (e.g., topical or systemic agents to reduce pressure) and laser or surgical procedures to open the drainage angle. Long-term management may involve continued medication or preventive procedures to avoid recurrence.

Prognosis and Follow-Up

With prompt treatment, vision loss can often be minimized or prevented. However, delayed intervention may result in permanent vision impairment. Follow-up care is essential to monitor intraocular pressure, optic nerve health, and treatment effectiveness. Regular eye examinations are recommended to detect recurrence or progression.

Complications

Potential complications include permanent vision loss, optic nerve damage, and chronic glaucoma. Untreated or recurrent episodes may lead to irreversible structural changes in the eye, increasing the risk of long-term visual impairment.

Lifestyle & Prevention

Preventive measures include avoiding medications that dilate the pupil without medical supervision, managing underlying conditions (e.g., hyperopia), and regular eye examinations for those with risk factors. Early detection of narrow angles through routine screening can help prevent acute episodes.

When to Seek Professional Help

Seek immediate medical attention if symptoms such as severe eye pain, blurred vision, halos around lights, or sudden vision loss occur. These may indicate an acute angle-closure glaucoma episode, which requires urgent treatment to preserve vision.

Tips for Medical Coders

Use H40.219 for acute angle-closure glaucoma when the eye is unspecified. Document the absence of laterality (right/left) or specify if the eye is not documented. Ensure clinical documentation supports the diagnosis and excludes other forms of glaucoma or eye conditions.