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L04.1 – Acute Lymphadenitis of the Neck
L04.1 is the ICD-10 code for acute lymphadenitis of the neck – a sudden inflammation of the cervical lymph nodes, most commonly caused by bacterial infections.
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L04.1 is the ICD-10 code for acute lymphadenitis of the neck – a sudden inflammation of the cervical lymph nodes, most commonly caused by bacterial infections.
What is L04.1 – Acute Lymphadenitis of the Neck?
The ICD-10 code L04.1 refers to acute lymphadenitis of the neck (also known as lymphadenitis colli acuta). This is a sudden-onset inflammation of one or more lymph nodes in the cervical (neck) region. Lymph nodes are part of the immune system and filter pathogens from lymphatic fluid. When they become inflamed, they swell and may become painful.
Causes
Acute lymphadenitis of the neck is most commonly caused by a bacterial infection, often originating from an infection in the mouth, throat, or dental region. Viral infections can also be responsible.
- Bacteria: Group A Streptococci, Staphylococci, and occasionally Mycobacterium tuberculosis
- Viruses: Epstein-Barr virus (infectious mononucleosis), adenoviruses, influenza viruses
- Primary infection sites: Tonsillitis, pharyngitis, dental infections, otitis media (middle ear infection), and wound infections in the head and neck region
Symptoms
Symptoms of acute cervical lymphadenitis typically develop rapidly and can be quite uncomfortable:
- Painful, swollen lymph nodes on one or both sides of the neck
- Local redness and warmth of the skin overlying the affected lymph node
- General malaise, fatigue, and weakness
- Fever, often above 38 °C (100.4 °F)
- Difficulty swallowing or pain when opening the mouth
- In severe cases: abscess formation (accumulation of pus within the lymph node)
Diagnosis
Diagnosis is typically made through a clinical examination. The physician palpates the lymph nodes to assess their size, consistency, tenderness, and mobility. Additional investigations may include:
- Blood tests and inflammatory markers: CRP, white blood cell count, ESR – elevated values indicate an active inflammatory process
- Swab cultures: From the throat or wound surface to identify the causative organism and determine antibiotic sensitivity
- Ultrasound (sonography): To evaluate the size, structure, and possible abscess formation within the lymph node
- Advanced imaging: CT or MRI scan in rare cases where deep neck infection is suspected
Treatment
Treatment depends on the underlying cause and severity of the inflammation:
Antibiotic Therapy
When a bacterial cause is identified, antibiotic therapy is the primary treatment. Commonly used agents include penicillin, amoxicillin, or cephalosporins. Treatment typically lasts 7 to 14 days.
Symptomatic Treatment
- Pain-relieving and fever-reducing medications (e.g., ibuprofen or paracetamol)
- Cool compresses applied to the swollen lymph nodes
- Adequate fluid intake and rest
Surgical Treatment
If an abscess has formed, surgical incision and drainage may be necessary to remove the accumulated pus.
Treatment of the Underlying Infection
The primary infection site (e.g., tonsillitis, dental abscess) should be treated concurrently to prevent recurrence and further spread of infection.
When to See a Doctor?
Medical attention should be sought promptly if there are severely swollen or painful neck lymph nodes, high fever, or signs of abscess formation (fluctuance, intense redness). If the swelling does not resolve within two weeks, further medical evaluation is essential to rule out other conditions such as lymphoma.
References
- World Health Organization (WHO) – ICD-10 International Classification of Diseases, 10th Revision, Code L04.1: Acute Lymphadenitis of Neck.
- Brook, I. – Microbiology and management of peritonsillar, retropharyngeal, and parapharyngeal abscesses. Journal of Oral and Maxillofacial Surgery, 2004; 62(12): 1545–1550.
- Bazemore, A.W., Smucker, D.R. – Lymphadenopathy and malignancy. American Family Physician, 2002; 66(11): 2103–2110.
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