L02.629 Furuncle of unspecified foot

Name of the Condition

• Furuncle of Unspecified Foot

Summary

A furuncle of the unspecified foot is a localized, painful infection of a hair follicle and surrounding tissue, resulting in a pus-filled lesion. It typically presents as a red, swollen, and tender nodule, often with a central core of pus. This condition arises from bacterial infection and can cause discomfort, especially when walking, if left untreated.

Causes

The primary cause is a bacterial infection, most commonly Staphylococcus aureus. Infections may develop from breaks in the skin, such as cuts, abrasions, or blocked hair follicles, allowing bacteria to enter and multiply. The infection triggers inflammation, leading to pus accumulation within the affected follicle.

Risk Factors

• Poor foot hygiene or occlusive footwear
• Compromised immune system (e.g., diabetes, HIV)
• Skin conditions (e.g., athlete’s foot, eczema)
• Recent foot trauma or minor injuries
• Close contact with infected individuals

Symptoms

• Red, swollen, and painful lump on the foot
• Warmth around the affected area
• Pus-filled center (may drain spontaneously)
• Fever or chills (in severe cases)
• Swollen nearby lymph nodes

Diagnosis

Diagnosis is typically made through a physical examination by a healthcare provider, who assesses the lesion’s appearance, location, and associated symptoms. In some cases, a sample of the pus may be collected for culture to identify the causative bacteria, especially if the infection is severe or recurrent.

Treatment Options

Treatment may include warm compresses to promote drainage, topical or oral antibiotics to address the infection, and pain management. For larger or persistent furuncles, incision and drainage may be necessary. Proper wound care and hygiene are essential to prevent recurrence.

Prognosis and Follow-Up

With appropriate treatment, most furuncles resolve within 1–2 weeks. Follow-up may be recommended to ensure healing and monitor for complications. Recurrence is possible, particularly in individuals with risk factors like compromised immunity or poor hygiene.

Complications

Untreated or severe infections can lead to cellulitis, abscess formation, or systemic infection (e.g., sepsis). Rarely, the infection may spread to deeper tissues or bones (osteomyelitis).

Lifestyle & Prevention

• Maintain good foot hygiene, including regular washing and drying.
• Wear clean, well-fitting footwear to reduce friction and moisture.
• Treat minor skin injuries promptly to prevent infection.
• Avoid sharing personal items (e.g., towels, shoes) with others.
• Manage underlying conditions like diabetes to support immune function.

When to Seek Professional Help

Seek care if the furuncle is large, worsening, or accompanied by fever, chills, or spreading redness. Prompt evaluation is necessary for recurrent infections, signs of systemic illness, or if the lesion does not improve with home care.

Tips for Medical Coders

Use this code for a furuncle of the foot when the specific foot (left, right, or other) is not documented. Ensure documentation supports the diagnosis of a furuncle (localized hair follicle infection with pus) and absence of more specific foot location details. Verify that the condition is not better classified under a related code (e.g., for carbuncles or abscesses) based on clinical findings.