H40.222 Chronic angle-closure glaucoma, left eye

Name of the Condition

• Chronic Angle-Closure Glaucoma, Left Eye

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. In this case, it affects the left eye, progressing slowly over time with minimal early symptoms but a risk of progressive 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

• Increased age, often affecting those over 40.
• Family history of glaucoma.
• Asian or Inuit descent.
• Farsightedness (hyperopia).
• Certain medications that dilate the pupils.

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

• Medications: To reduce intraocular pressure, such as prostaglandin analogs, beta-blockers, or carbonic anhydrase inhibitors.
• Laser therapy: Laser peripheral iridotomy or iridoplasty to improve drainage.
• Surgery: Trabeculectomy or minimally invasive glaucoma surgery (MIGS) for severe cases.

Prognosis and Follow-Up

With early diagnosis and consistent treatment, vision loss can often be slowed or prevented. Regular follow-up appointments are essential to monitor intraocular pressure and optic nerve health. Untreated cases may lead to permanent vision impairment.

Complications

• Permanent vision loss or blindness.
• Optic nerve damage.
• Acute angle-closure crisis (if the condition progresses rapidly).

Lifestyle & Prevention

• Regular eye exams, especially for those with risk factors.
• Avoiding medications that dilate the pupils without consulting a doctor.
• Managing systemic conditions like diabetes or hypertension.

When to Seek Professional Help

Seek immediate care if experiencing sudden eye pain, severe headache, blurred vision, or halos around lights, as these may indicate acute angle-closure glaucoma. Routine check-ups are recommended for ongoing monitoring.

Tips for Medical Coders

Document the affected eye (left) and specify chronic angle-closure glaucoma. Ensure clinical notes support the diagnosis and stage, if applicable. Use this code for confirmed cases; acute or unspecified stages require different codes.