A36.86 Diphtheritic conjunctivitis

Name of the Condition

• Diphtheritic conjunctivitis

Summary

Diphtheritic conjunctivitis is a localized form of diphtheria affecting the conjunctiva, the mucous membrane lining the eyelids and covering the white part of the eye. It is caused by Corynebacterium diphtheriae and may involve toxin-mediated tissue damage, leading to inflammation, discharge, and potential complications if untreated.

Causes

Diphtheritic conjunctivitis is caused by infection with Corynebacterium diphtheriae, a gram-positive bacterium. The disease spreads through direct contact with infected secretions or contaminated objects, such as towels or hands. The exotoxin produced by the bacteria is responsible for local tissue damage and inflammation of the conjunctiva.

Risk Factors

• Lack of vaccination or incomplete immunization against diphtheria.
• Close contact with an infected individual or contaminated surfaces.
• Poor hygiene practices, especially around the eyes.
• Living in or traveling to areas with low vaccination coverage.

Symptoms

• Redness, swelling, or irritation of the eyelids and conjunctiva.
• Discharge from the eyes, which may be watery or pus-like.
• Pain or discomfort in the eye area.
• Formation of a grayish membrane on the conjunctiva in severe cases.
• Sensitivity to light (photophobia) or blurred vision.

Diagnosis

Diagnosis involves clinical evaluation of eye symptoms and examination of the conjunctiva. Laboratory tests, such as cultures or PCR, confirm the presence of Corynebacterium diphtheriae. A history of exposure to diphtheria or lack of vaccination may also support the diagnosis.

Treatment Options

• Administration of diphtheria antitoxin to neutralize the toxin.
• Antibiotics (e.g., penicillin or erythromycin) to eliminate the bacterial infection.
• Topical treatments, such as eye drops or ointments, to reduce inflammation and prevent secondary infections.
• Supportive care, including eye hygiene and pain management.

Prognosis and Follow-Up

With prompt treatment, the prognosis for diphtheritic conjunctivitis is generally good. Most patients recover fully without long-term eye damage. Follow-up may include monitoring for resolution of symptoms and ensuring complete eradication of the infection to prevent recurrence or complications.

Complications

• Corneal damage or scarring, potentially leading to vision impairment.
• Spread of infection to other parts of the eye or surrounding tissues.
• Systemic effects if the diphtheria toxin spreads beyond the conjunctiva.

Lifestyle & Prevention

• Maintain good hand and eye hygiene to reduce exposure to bacteria.
• Ensure up-to-date vaccination against diphtheria, as recommended by public health guidelines.
• Avoid sharing personal items (e.g., towels, makeup) that may carry infection.
• Seek prompt medical care if eye symptoms develop, especially in areas with known diphtheria activity.

When to Seek Professional Help

• If eye redness, discharge, or pain persists or worsens.
• If a grayish membrane forms on the conjunctiva.
• If vision changes occur, such as blurriness or sensitivity to light.
• If there is a known exposure to diphtheria or symptoms of systemic infection (e.g., fever, malaise).

Tips for Medical Coders

When coding for diphtheritic conjunctivitis, use the ICD-10-CM code A36.86. Ensure documentation supports the diagnosis, including clinical findings (e.g., conjunctival inflammation, discharge) and laboratory confirmation of Corynebacterium diphtheriae if available. Note any associated complications or treatment provided to support accurate coding.