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L04.0 – Acute Lymphadenitis Face, Head and Neck

L04.0 is the ICD-10 diagnosis code for acute lymphadenitis of the face, head, and neck – a painful inflammation of the lymph nodes in this region.

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Things worth knowing about "L04.0"

L04.0 is the ICD-10 diagnosis code for acute lymphadenitis of the face, head, and neck – a painful inflammation of the lymph nodes in this region.

What is L04.0?

L04.0 is the ICD-10 diagnosis code for acute lymphadenitis of the face, head, and neck. Lymphadenitis refers to inflammation of the lymph nodes, usually triggered by a nearby infection. The condition frequently occurs as a secondary finding in infections of the mouth, throat, or dental region.

Causes

Acute lymphadenitis is most commonly caused by bacterial or viral pathogens that travel via the lymphatic system from a nearby infection site into the lymph nodes. Common triggers include:

Bacterial infections: e.g., streptococci, staphylococci (most frequent pathogens)
Viral infections: e.g., Epstein-Barr virus (infectious mononucleosis), adenoviruses
Dental infections and abscesses in the jaw or dental area
Tonsillitis and pharyngitis (throat infection)
Wounds or skin infections on the face or head
Otitis media (middle ear infection)

Symptoms

Typical symptoms of acute lymphadenitis in the face, head, and neck area include:

Painful, swollen lymph nodes along the neck, under the jaw, or behind the ears
Redness and warmth over the affected lymph nodes
General malaise and fatigue
Fever, often indicating a systemic inflammatory response
Possible fluctuation (softening) of lymph nodes if an abscess forms
Restricted neck movement or pain when swallowing

Diagnosis

The diagnosis is usually made clinically. The physician palpates the lymph nodes and assesses size, consistency, and tenderness. Additional diagnostic measures may include:

Blood tests: Elevated inflammatory markers (CRP, leukocytosis) indicate infection
Ultrasound: To evaluate lymph node size and distinguish an abscess
Swabs or cultures: To identify the causative pathogen in purulent cases
CT or MRI: When deeper infections or complications are suspected

Treatment

Treatment depends on the underlying cause:

Antibiotics: First-line therapy for bacterial causes (e.g., amoxicillin-clavulanate, cephalosporins)
Analgesics and anti-inflammatory drugs: To relieve pain and inflammation (e.g., ibuprofen, paracetamol)
Surgical drainage: Required if an abscess has formed, involving incision and irrigation
Treatment of the underlying condition: e.g., tooth extraction, treatment of tonsillitis
Cooling compresses: May help relieve local discomfort

When to See a Doctor?

If swollen, tender lymph nodes in the neck or face do not resolve within a few days, or if high fever, severe swelling, or difficulty swallowing occur, medical attention should be sought promptly. Untreated lymphadenitis can progress to an abscess or phlegmon (diffuse soft-tissue infection).

References

World Health Organization (WHO): ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th Revision, Vol. 1. Geneva: WHO, 2019.
Brook, I.: Microbiology and management of peritonsillar, retropharyngeal, and parapharyngeal abscesses. Journal of Oral and Maxillofacial Surgery, 2004; 62(12):1545–1550. PubMed PMID: 15573356.
Leung, A.K.C. & Davies, H.D.: Cervical lymphadenitis: etiology, diagnosis, and management. Current Infectious Disease Reports, 2009; 11(3):183–189. PubMed PMID: 19366573.

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