B60.12 Conjunctivitis due to Acanthamoeba

Name of the Condition

• Conjunctivitis due to Acanthamoeba

Summary

Conjunctivitis due to Acanthamoeba is an infection of the conjunctiva caused by the free-living amoeba Acanthamoeba. This condition typically presents with eye inflammation and requires specific diagnostic methods to confirm the causative agent. Treatment focuses on antimicrobial therapy to address the infection and manage symptoms.

Causes

The infection is caused by Acanthamoeba species, which are found in environmental sources such as soil, water, and contact lens solutions. Transmission often occurs through exposure to contaminated water (e.g., swimming in lakes or using tap water to clean contact lenses) or contact with contaminated lens care products. The amoeba can invade the eye, leading to inflammation of the conjunctiva.

Risk Factors

• Use of contact lenses with improper hygiene or contaminated solutions.
• Exposure to contaminated water sources, such as swimming pools or tap water.
• Trauma to the eye or use of non-sterile eye care products.
• Weakened immune system, which may increase susceptibility to severe infection.

Symptoms

• Eye redness, irritation, or a gritty sensation.
• Excessive tearing or discharge.
• Blurred vision or sensitivity to light.
• Pain or discomfort in the affected eye.

Diagnosis

Diagnosis involves a thorough eye examination and laboratory testing. Clinical evaluation may include slit-lamp microscopy to assess the cornea and conjunctiva. Laboratory confirmation typically requires culturing or molecular testing (e.g., PCR) to identify Acanthamoeba in eye samples, such as conjunctival scrapings or contact lens solution.

Treatment Options

Treatment usually involves topical antimicrobial agents, such as biguanides (e.g., polyhexamethylene biguanide) or diamidines (e.g., propamidine isethionate), to target the amoeba. In severe cases, systemic therapy may be considered. Management also includes discontinuing contact lens use and ensuring proper eye hygiene to prevent further contamination.

Prognosis and Follow-Up

With early diagnosis and appropriate treatment, the prognosis for conjunctivitis due to Acanthamoeba is generally favorable. However, delayed treatment can lead to complications, such as corneal scarring or vision impairment. Follow-up care involves monitoring for resolution of symptoms and assessing visual acuity to ensure recovery.

Complications

• Corneal ulceration or scarring, which may affect vision.
• Chronic eye inflammation or persistent discomfort.
• Secondary bacterial infection of the eye.
• In rare cases, progression to more severe ocular disease, such as keratitis.

Lifestyle & Prevention

• Avoid using tap water to clean contact lenses or lens cases.
• Use sterile saline or recommended lens care solutions.
• Replace contact lens cases regularly and store them in a clean, dry place.
• Remove contact lenses before swimming or using hot tubs.
• Practice good hand hygiene when handling lenses or touching the eyes.

When to Seek Professional Help

Seek medical attention if you experience persistent eye redness, pain, or vision changes, especially if you wear contact lenses or have been exposed to contaminated water. Prompt evaluation is important to prevent complications and ensure appropriate treatment.

Tips for Medical Coders

When coding for conjunctivitis due to Acanthamoeba (ICD-10-CM code B60.12), ensure documentation supports the diagnosis, including clinical findings (e.g., eye redness, discharge) and confirmation of Acanthamoeba infection (e.g., laboratory results). Verify that the code is used for the specific condition and not for other forms of conjunctivitis.