L03.0 – Cellulitis of Fingers and Toes
L03.0 is the ICD-10 code for cellulitis of the fingers and toes – a bacterial soft tissue infection causing redness, swelling, and pain.
Things worth knowing about "L03.0"
L03.0 is the ICD-10 code for cellulitis of the fingers and toes – a bacterial soft tissue infection causing redness, swelling, and pain.
What is L03.0?
The ICD-10 code L03.0 refers to cellulitis of the fingers and toes. Cellulitis is an acute, diffuse bacterial infection of the soft tissue that spreads beyond tissue boundaries and does not form a localized abscess. Unlike an abscess, it spreads diffusely through the subcutaneous tissue, fascia, or muscle.
Causes
Cellulitis of the fingers and toes is most commonly caused by bacteria entering the tissue through small breaks in the skin. Common entry points include:
- Cuts, puncture wounds, or ulcers on fingers or toes
- Nail fold infections (paronychia)
- Insect bites or animal bites
- Diabetic foot lesions
- Ingrown toenails
The most frequent causative organisms are Staphylococcus aureus (including MRSA) and Streptococcus pyogenes. Gram-negative bacteria may be involved in immunocompromised patients or following animal bites.
Symptoms
Typical clinical signs of cellulitis affecting the fingers and toes include:
- Redness of the affected skin (erythema)
- Swelling and edema of the tissue
- Warmth in the affected area
- Pain on touch and movement
- General malaise and occasionally fever
- In severe cases: lymphangitis (red streaking) and enlarged lymph nodes
Diagnosis
Diagnosis is primarily clinical, based on the appearance and extent of the inflammation. Additional investigations may include:
- Blood tests: Elevated inflammatory markers such as CRP and white blood cell count
- Wound swab or culture: To identify the causative organism and determine antibiotic sensitivity
- Imaging (ultrasound, MRI): If deeper tissue involvement, abscess formation, or osteomyelitis is suspected
Treatment
Treatment depends on the severity and extent of the infection:
Mild to Moderate Cases
- Oral antibiotics (e.g., flucloxacillin, amoxicillin-clavulanate)
- Elevation and immobilization of the affected limb
- Close medical follow-up
Severe or Spreading Infections
- Hospital admission and intravenous antibiotic therapy
- Surgical intervention for abscess drainage or removal of necrotic tissue
- If MRSA is suspected: use of vancomycin or linezolid
If left untreated, cellulitis can lead to serious complications such as sepsis, osteomyelitis, or necrotizing fasciitis. Early medical treatment is therefore essential.
References
- World Health Organization (WHO): ICD-10 Classification of Mental and Behavioural Disorders, Code L03.0 – Cellulitis of fingers and toes, Geneva.
- Stevens D.L. et al.: Practice Guidelines for the Diagnosis and Management of Skin and Soft Tissue Infections. Clinical Infectious Diseases, 2014;59(2):e10-e52.
- Kilburn S.A. et al.: Interventions for cellulitis and erysipelas. Cochrane Database of Systematic Reviews, 2010.
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