ICD-10 Code L04.8 – Acute lymphadenitis of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L04.8 – Acute lymphadenitis of other sites
What it is
L04.8 identifies acute inflammation of lymph nodes in sites other than the common regional groups named in more specific codes. Use it when documentation states acute lymphadenitis at another location and no more specific site is recorded.
Clinical signs
Typical findings include enlarged, tender lymph nodes with localized pain and sometimes overlying warmth or redness. Clinical features vary; refer to documentation.
When to use this code
Use L04.8 when the provider documents acute lymphadenitis affecting an unspecified other site, such as a node group not captured by a more specific code. It is appropriate when the record supports an acute process and the anatomic site is clearly described but not separately coded.
Do not assume this code for chronic lymph node enlargement or for generalized lymphadenopathy without acute inflammation. Check documentation if the note only mentions swollen nodes without confirming lymphadenitis.
Do not use for
Do not use it for chronic lymphadenitis, generalized lymphadenopathy, or lymph node enlargement due to malignancy or another noninfectious cause. Check documentation when the site or acuity is unclear.
Coding tip
Match the code to both acuity and site; if either is missing, query the provider before assigning L04.8.