B01.81 Varicella keratitis

Name of the Condition

• Varicella keratitis

Summary

Varicella keratitis is a complication of varicella (chickenpox) infection involving inflammation of the cornea, the clear front surface of the eye. It occurs when the varicella-zoster virus (VZV) affects the ocular structures, potentially leading to visual disturbances or discomfort. Prompt evaluation and management are important to prevent long-term eye damage.

Causes

Varicella keratitis is caused by the varicella-zoster virus (VZV), the same virus responsible for chickenpox. The virus can spread to the eye during or after a primary varicella infection, leading to corneal inflammation. This may result from direct viral invasion or an immune-mediated response targeting ocular tissues.

Risk Factors

• Lack of prior varicella vaccination or previous infection.
• Immunocompromised states, such as HIV/AIDS, chemotherapy, or chronic steroid use.
• Age, with infants and adults at higher risk for severe disease.
• Pregnancy, which increases the risk of severe maternal complications.
• Close contact with an infected individual, especially in enclosed settings.

Symptoms

• Eye pain or discomfort.
• Redness of the eye.
• Blurred vision or visual disturbances.
• Sensitivity to light (photophobia).
• Excessive tearing or discharge.
• Feeling of a foreign body in the eye.

Diagnosis

Diagnosis of varicella keratitis involves a clinical examination of the eye, often using a slit lamp to assess corneal changes. Healthcare providers may also consider the patient's history of varicella infection or exposure. In some cases, additional tests, such as corneal scrapings or viral cultures, may be performed to confirm the presence of VZV.

Treatment Options

Treatment typically includes antiviral medications to target the varicella-zoster virus, such as acyclovir or valacyclovir. Topical antiviral eye drops may be prescribed to reduce viral replication in the eye. Pain relief and lubricating eye drops can help manage symptoms. Severe cases may require close monitoring or additional interventions to prevent complications.

Prognosis and Follow-Up

With appropriate treatment, most individuals recover without lasting eye damage. However, delayed or inadequate care can lead to scarring, vision impairment, or recurrent episodes. Follow-up appointments are important to monitor healing and address any persistent symptoms or complications.

Complications

Potential complications include corneal scarring, which may affect vision, and recurrent keratitis. In rare cases, the infection could spread to other parts of the eye, leading to more severe ocular issues. Long-term vision problems are possible if the condition is not managed promptly.

Lifestyle & Prevention

Preventing varicella through vaccination is the most effective way to reduce the risk of varicella keratitis. Avoiding close contact with infected individuals and maintaining good hand hygiene can also help. For those with a history of varicella, protecting the eyes from injury or irritation may support overall ocular health.

When to Seek Professional Help

Seek medical attention if you experience sudden eye pain, redness, blurred vision, or sensitivity to light, especially if you have recently had chickenpox or been exposed to someone with the infection. Early evaluation can prevent complications and ensure appropriate treatment.

Tips for Medical Coders

When coding for varicella keratitis, use the ICD-10-CM code B01.81. Ensure documentation supports the diagnosis, including clinical findings (e.g., corneal inflammation) and a history of varicella or exposure. Verify that the code is not used for other ocular conditions unrelated to VZV infection.