ICD-10-CM > L00-L99 > L00-L08 > L04 L04 Acute lymphadenitis Non-Billable/Non-Specific Includes abscess (acute) of lymph nodes, except mesentericacute lymphadenitis, except mesenteric Type 1 Excludes chronic or subacute lymphadenitis, except mesenteric (I88.1)enlarged lymph nodes (R59.-)human immunodeficiency virus [HIV] disease resulting in generalized lymphadenopathy (B20)lymphadenitis NOS (I88.9)nonspecific mesenteric lymphadenitis (I88.0) Codes L04.0Acute lymphadenitis of face, head and neckL04.1Acute lymphadenitis of trunkL04.2Acute lymphadenitis of upper limbL04.3Acute lymphadenitis of lower limbL04.8Acute lymphadenitis of other sitesL04.9Acute lymphadenitis, unspecified