ICD-10 Code L04.0 – Acute lymphadenitis of face, head and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L04.0 – Acute lymphadenitis of face, head and neck
What it is
L04.0 identifies acute inflammation of lymph nodes in the face, head, or neck. It usually reflects a short-term infectious or inflammatory process in nearby tissues.
Clinical signs
Typical findings include tender, enlarged lymph nodes in the head or neck region, sometimes with redness or warmth over the area. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents acute lymphadenitis affecting lymph nodes of the face, head, or neck. Apply it when the record supports a localized, acute nodal infection or inflammation in this region. If the note only says lymph node swelling without acuity or location, check documentation.
Do not use for
Do not use L04.0 for chronic lymphadenitis, generalized lymphadenopathy, or enlarged nodes without an acute inflammatory diagnosis. Check documentation if the condition is secondary to another confirmed infection.
Coding tip
Code the documented site and acuity exactly as stated; if the location is unclear, query the provider.