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L03.1 – Cellulitis of Finger and Toe
L03.1 is the ICD-10 code for cellulitis of the finger and toe – a bacterial soft tissue infection that requires prompt medical evaluation and treatment.
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L03.1 is the ICD-10 code for cellulitis of the finger and toe – a bacterial soft tissue infection that requires prompt medical evaluation and treatment.
What is L03.1?
The ICD-10 code L03.1 refers to cellulitis of the finger and toe (also termed phlegmon of the finger and toe). Cellulitis is an acute, spreading bacterial infection of the deep dermis and subcutaneous tissue. Unlike an abscess, it does not form a clearly demarcated cavity but diffusely infiltrates surrounding tissue. In L03.1, the soft tissue of the fingers and toes is affected.
Causes
The condition is most commonly caused by bacteria that enter through breaks in the skin barrier. The most frequent causative organisms are:
- Streptococcus pyogenes (Group A Streptococcus)
- Staphylococcus aureus, including MRSA
- Gram-negative bacteria in immunocompromised patients (less common)
Common portals of entry include:
- Cuts, abrasions, or skin fissures
- Nail injuries or ingrown nails
- Insect bites or animal bites
- Fungal infections (e.g., athlete's foot) that compromise the skin barrier
Risk Factors
Several underlying conditions and lifestyle factors increase the risk of developing cellulitis:
- Diabetes mellitus (impaired wound healing, peripheral neuropathy)
- Lymphedema or chronic venous insufficiency
- Immunosuppression (e.g., due to medications or HIV infection)
- Obesity
- Poor peripheral circulation
Symptoms
The classic signs of inflammation appear locally at the affected finger or toe:
- Redness of the skin (erythema)
- Swelling of the soft tissue
- Warmth over the affected area
- Pain or tenderness on touch or movement
- Restricted range of motion
- In more severe cases: fever, chills, and general malaise
Diagnosis
Diagnosis is primarily clinical, based on the appearance of the affected area. Additional investigations may include:
- Blood tests: elevated inflammatory markers (CRP, white blood cell count)
- Wound swab for bacterial culture and sensitivity testing
- Imaging (ultrasound or MRI) if a deeper infection or abscess formation is suspected
Treatment
Conservative Treatment
In early stages, cellulitis is treated with antibiotics. The choice of antibiotic depends on the suspected or confirmed pathogen. Commonly used agents include penicillin, amoxicillin-clavulanate, or cephalosporins. If MRSA is suspected, clindamycin or trimethoprim-sulfamethoxazole may be used. Supportive measures include rest, elevation of the affected limb, and cool compresses.
Surgical Treatment
If an abscess develops or the infection fails to respond to antibiotics, surgical intervention is required. This involves incision and drainage of the infected tissue. In severe cases, hospital admission with intravenous antibiotic therapy may be necessary.
When to Seek Immediate Medical Attention
If the redness spreads rapidly, high fever develops, pain becomes severe, or red streaks appear (a sign of lymphangitis), immediate medical attention should be sought, as there is a risk of sepsis.
References
- Stevens DL et al. – Practice guidelines for the diagnosis and management of skin and soft tissue infections: 2014 update by the Infectious Diseases Society of America. Clinical Infectious Diseases, 2014;59(2):e10–e52.
- Eron LJ et al. – Managing skin and soft tissue infections: expert panel recommendations on key decision points. Journal of Antimicrobial Chemotherapy, 2003;52(Suppl 1):i3–i17.
- World Health Organization (WHO): ICD-10 Version 2019 – L03.1 Cellulitis of finger and toe. Available at: icd.who.int
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