B37.84 Candidal otitis externa

Name of the Condition

• Candidal Otitis Externa (ICD Code: B37.84)
• Technical term: Candidal otitis externa
• ICD-10 Code: B37.84

Summary

Candidal otitis externa is a fungal infection of the external ear canal caused by Candida species, most commonly Candida albicans. It results from the overgrowth of yeast in the ear canal, leading to inflammation and tissue involvement. The condition typically presents with localized symptoms and may occur in individuals with predisposing factors, such as moisture retention or compromised immune function.

Causes

Candidal otitis externa occurs when Candida fungi, normally present in small amounts in the ear canal, overgrow due to disruptions in the local microbial balance. This overgrowth can be triggered by factors like prolonged moisture exposure, use of antibiotics or corticosteroids, or damage to the ear canal lining. Invasive forms may arise from direct inoculation or spread from adjacent sites.

Risk Factors

• Weakened immune system (e.g., HIV/AIDS, chemotherapy, immunosuppressive therapy).
• Prolonged use of broad-spectrum antibiotics or topical corticosteroids.
• Chronic moisture in the ear (e.g., swimming, humid environments).
• Ear trauma or frequent use of earbuds/inserts.
• Diabetes mellitus or poorly controlled blood sugar.
• Pre-existing ear conditions (e.g., eczema, psoriasis).

Symptoms

• Itching, redness, or swelling of the ear canal.
• Discharge (often white, creamy, or curd-like).
• Pain or discomfort, especially when touching the ear.
• Temporary hearing loss or a feeling of fullness.
• Scaling or flaking of the ear canal skin.

Diagnosis

Diagnosis is typically based on clinical evaluation, including inspection of the ear canal for characteristic signs like discharge or inflammation. A sample of ear discharge may be collected for microscopic examination or culture to confirm the presence of Candida. Additional tests, such as otoscopy or audiometry, may be used to assess severity or rule out other conditions.

Treatment Options

Treatment usually involves topical antifungal medications, such as clotrimazole or miconazole, applied directly to the ear canal. In severe or recurrent cases, oral antifungals or corticosteroids may be prescribed to reduce inflammation. Keeping the ear dry and avoiding irritants (e.g., water, cotton swabs) is also recommended.

Prognosis and Follow-Up

With appropriate treatment, candidal otitis externa generally resolves within 1–2 weeks. Follow-up may be needed to ensure complete clearance and prevent recurrence. Individuals with underlying risk factors should be monitored for recurrent infections or complications.

Complications

• Chronic or recurrent infection if not properly treated.
• Spread of infection to surrounding tissues (e.g., otitis media).
• Temporary hearing loss due to ear canal swelling.
• Skin breakdown or secondary bacterial infection.

Lifestyle & Prevention

• Keep ears dry after swimming or bathing (use earplugs if needed).
• Avoid inserting objects (e.g., cotton swabs) into the ear canal.
• Manage underlying conditions like diabetes or eczema.
• Use antifungal powders or drops if prone to moisture-related infections.
• Avoid overuse of topical antibiotics or corticosteroids in the ear.

When to Seek Professional Help

Seek medical attention if symptoms persist for more than a week, worsen, or include severe pain, fever, or hearing loss. Prompt care is important for individuals with weakened immune systems or recurrent infections.

Tips for Medical Coders

Document the presence of fungal infection in the ear canal, including any contributing factors (e.g., moisture, immunosuppression) and treatment provided. Ensure the diagnosis aligns with clinical findings and laboratory confirmation if available. Code B37.84 is specific to candidal otitis externa and should not be used for other ear infections or fungal conditions.