H40.2291 Chronic angle-closure glaucoma, unspecified eye, mild stage

Name of the Condition

• Chronic Angle-Closure Glaucoma, Unspecified Eye, Mild Stage

Summary

Chronic angle-closure glaucoma is an eye condition characterized by gradual, partial blockage of the eye's drainage angle, leading to increased intraocular pressure and potential optic nerve damage. This form progresses slowly over time, often with minimal early symptoms but a risk of progressive vision loss if untreated. The term "unspecified eye" indicates the condition affects one eye, but the specific side is not documented, and "mild stage" denotes an early phase of the disease with limited structural or functional changes.

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. In some cases, it may 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 focuses on reducing intraocular pressure and preventing progression. Options may include medications (e.g., eye drops), laser therapy (e.g., laser peripheral iridotomy), or surgical procedures (e.g., trabeculectomy). The choice depends on the severity and individual patient factors.

Prognosis and Follow-Up

With early diagnosis and appropriate management, the prognosis is generally favorable, and vision loss can be slowed or prevented. Regular follow-up appointments are essential to monitor intraocular pressure, optic nerve health, and treatment effectiveness. Lifelong management is typically required.

Complications

If left untreated, chronic angle-closure glaucoma can lead to progressive optic nerve damage, permanent vision loss, and blindness. Advanced stages may also cause irreversible changes to the drainage angle.

Lifestyle & Prevention

• Regular eye exams, especially for those with risk factors.
• Avoiding medications that dilate the pupil without medical supervision.
• Managing systemic conditions like diabetes or hypertension that may affect eye health.
• Protecting eyes from injury.

When to Seek Professional Help

Seek immediate medical attention if you experience sudden severe eye pain, headache, nausea, blurred vision, or halos around lights, as these may indicate acute angle-closure glaucoma, a medical emergency. For chronic cases, consult an eye care professional if symptoms worsen or new changes in vision occur.

Tips for Medical Coders

Use this code for chronic angle-closure glaucoma affecting one eye (unspecified side) in the mild stage. Document the eye laterality and stage clearly in the medical record to support accurate coding. Ensure the diagnosis aligns with clinical findings, such as intraocular pressure measurements and drainage angle assessment.