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L03.8 – Cellulitis of Other Sites
L03.8 is an ICD-10 diagnosis code for cellulitis and phlegmon of other sites. It describes a bacterial skin infection that can affect deeper tissue layers.
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L03.8 is an ICD-10 diagnosis code for cellulitis and phlegmon of other sites. It describes a bacterial skin infection that can affect deeper tissue layers.
Definition
L03.8 is an ICD-10 diagnosis code used to classify cellulitis and phlegmon of other and unspecified sites. This code applies when a bacterial infection of the skin and subcutaneous tissue is present but cannot be assigned to a more specific category within the ICD-10 group L03 (e.g., finger, toe, face, or trunk).
Causes
Cellulitis and phlegmon are typically caused by bacteria that enter the deeper layers of the skin through minor injuries, wounds, or breaks in the skin. The most common causative organisms include:
- Streptococcus pyogenes (Group A streptococci)
- Staphylococcus aureus, including MRSA (methicillin-resistant Staphylococcus aureus)
- Less commonly: Gram-negative bacteria or anaerobic organisms, particularly in immunocompromised individuals
Risk factors for developing cellulitis include:
- Skin injuries, insect bites, or surgical wounds
- Chronic skin conditions such as eczema or psoriasis
- Lymphedema or venous insufficiency
- Diabetes mellitus or immunodeficiency
- Obesity
Symptoms
Typical signs and symptoms of cellulitis and phlegmon at the affected site include:
- Redness of the skin, which may spread rapidly
- Swelling and edema in the affected area
- Warmth and increased skin temperature
- Pain or tenderness on palpation
- Systemic signs such as fever, chills, and malaise in more severe cases
- Regional lymph node enlargement near the site of infection
In contrast to phlegmon, which spreads diffusely into deeper tissue layers such as fascia and muscle, cellulitis is typically confined to the subcutaneous fatty tissue.
Diagnosis
Diagnosis is primarily clinical, based on the appearance of the affected skin region and the medical history. Additional diagnostic measures may include:
- Complete blood count and inflammatory markers (CRP, leukocytes, ESR) to assess the extent of infection
- Blood cultures if sepsis or severe systemic infection is suspected
- Wound swab or culture for pathogen identification and antibiotic resistance testing
- Imaging (ultrasound or MRI) to exclude abscess formation or deeper infections such as necrotizing fasciitis
Treatment
Treatment depends on the severity of the infection:
Mild to Moderate Cases
- Oral antibiotics: Typically penicillins, first-generation cephalosporins (e.g., cefalexin), or clindamycin. In cases with suspected MRSA, trimethoprim/sulfamethoxazole or doxycycline may be used.
- Elevation of the affected limb to reduce edema
- Cooling and analgesic measures for pain relief
Severe or Hospitalized Cases
- Inpatient admission with intravenous antibiotic therapy (e.g., cefazolin, ampicillin/sulbactam, or vancomycin for MRSA)
- Surgical intervention in cases of abscess formation or necrotizing fasciitis (surgical debridement)
Recurrence Prevention
For patients with recurrent episodes, long-term prophylaxis with low-dose penicillin or erythromycin may be considered. Underlying risk factors such as lymphedema or diabetes should also be optimally managed.
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.
- World Health Organization (WHO): ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th Revision, Volume 1. Geneva: WHO, 2019.
- Raff AB, Kroshinsky D. Cellulitis: A Review. JAMA, 2016; 316(3): 325–337.
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