H40.2293 Chronic angle-closure glaucoma, unspecified eye, severe stage

Name of the Condition

• Chronic Angle-Closure Glaucoma, Unspecified Eye, Severe 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 "severe stage" denotes advanced disease with significant 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 testing may also be used to detect peripheral vision loss.

Treatment Options

Treatment aims to lower intraocular pressure and prevent further damage. Options include medications (eye drops or oral drugs), laser therapy (e.g., laser peripheral iridotomy), or surgery (e.g., trabeculectomy or aqueous shunt implantation). Severe cases may require multiple interventions.

Prognosis and Follow-Up

Prognosis depends on early detection and adherence to treatment. Regular follow-up appointments are essential to monitor intraocular pressure, optic nerve health, and visual function. Untreated severe cases may lead to permanent vision loss.

Complications

• Permanent vision loss or blindness.
• Optic nerve damage.
• Increased intraocular pressure despite treatment.
• Reduced quality of life due to visual impairment.

Lifestyle & Prevention

• Regular eye exams, especially for those with risk factors.
• Avoiding medications that dilate the pupil without consulting a provider.
• Managing other health conditions (e.g., diabetes) that may affect eye health.
• Protecting eyes from injury.

When to Seek Professional Help

Seek immediate care if experiencing sudden vision changes, severe eye pain, headache, nausea, or vomiting, as these may indicate acute angle-closure glaucoma, a medical emergency.

Tips for Medical Coders

Document the eye affected (unspecified) and the severe stage clearly. Ensure clinical documentation supports the severity level to justify the code. Verify that the diagnosis aligns with the anatomical and clinical criteria for chronic angle-closure glaucoma.