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L04.8 – Acute Lymphadenitis of Other Sites
L04.8 is the ICD-10 code for acute lymphadenitis of other sites – a painful inflammation of lymph nodes occurring outside the classically defined body regions.
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L04.8 is the ICD-10 code for acute lymphadenitis of other sites – a painful inflammation of lymph nodes occurring outside the classically defined body regions.
What is L04.8?
The ICD-10 code L04.8 refers to acute lymphadenitis of other sites. Lymphadenitis is an inflammation of one or more lymph nodes, most commonly caused by a bacterial – and less frequently a viral – infection. The code L04.8 is used when the inflammation occurs at a location not covered by the more specific subcategories L04.0 through L04.3 (e.g., not in the face, neck, trunk, or axillary/inguinal region).
Causes
Acute lymphadenitis typically develops as a response to an infection in the drainage area of the affected lymph node. Common causes include:
- Bacterial infections: Staphylococcus aureus and Streptococcus pyogenes are the most frequent pathogens. Other bacteria may also be involved.
- Viral infections: Viruses such as the Epstein-Barr virus (infectious mononucleosis) or adenoviruses can trigger lymph node inflammation.
- Wounds and skin infections: Entry points for pathogens such as cuts, abscesses, or furuncles in the affected body area.
- Rare causes: Mycobacterial infections (e.g., tuberculosis) or fungal infections can also cause lymphadenitis.
Symptoms
Typical symptoms of acute lymphadenitis include:
- Painfully enlarged lymph nodes at the affected site
- Redness and warmth of the surrounding skin
- Swelling in the affected area
- General signs of infection such as fever, fatigue, and malaise
- In advanced cases, possible abscess formation (accumulation of pus within the lymph node)
Diagnosis
The diagnosis of acute lymphadenitis is usually made clinically through:
- Physical examination: Palpation of the lymph nodes, assessment of size, consistency, mobility, and tenderness.
- Blood tests: Elevated inflammatory markers such as CRP (C-reactive protein) and increased leukocyte (white blood cell) counts indicate an infection.
- Imaging: Ultrasound can be used to assess the lymph nodes and rule out abscess formation.
- Pathogen identification: Swabs or blood cultures may be taken to identify the causative organism.
- Histological examination: In unclear cases, a lymph node biopsy may be necessary to exclude other causes (e.g., lymphoma).
Treatment
Treatment depends on the underlying cause and the severity of the lymphadenitis:
- Antibiotics: For bacterial causes, antibiotic therapy (typically with penicillin, amoxicillin, or cephalosporins) is the treatment of choice. The selection is based on the suspected or confirmed pathogen.
- Surgical intervention: If an abscess has formed, surgical incision and drainage may be necessary.
- Symptomatic therapy: Pain relievers (e.g., ibuprofen or paracetamol) can be used to relieve pain and fever.
- Treatment of the underlying condition: Treating the causative infection (e.g., wound care) is essential for recovery.
When to See a Doctor?
Medical attention should be sought promptly if lymph nodes remain persistently swollen and painful, if there is high fever, increasing redness, or signs of abscess formation. Lymph node swelling that persists for several weeks without a clear explanation should always be evaluated by a healthcare professional.
References
- World Health Organization (WHO): ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th Revision, Volume 1. WHO, Geneva.
- Swartz, M.N.: Lymphadenitis and Lymphangitis. In: Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. Elsevier, 9th Edition, 2020.
- Ferrer, R.: Lymphadenopathy: Differential Diagnosis and Evaluation. American Family Physician. 1998;58(6):1313–1320. Available via PubMed.
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