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L04

⚠ Non-billable (Header)

Acute lymphadenitis

Diseases of the skin and subcutaneous tissue (L00-L99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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✅ Includes

  • • abscess (acute) of lymph nodes, except mesenteric
  • • acute lymphadenitis, except mesenteric

❌ Excludes1

direct

Cannot be coded with L04

  • • 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)

Child Codes (6)

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

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Code Information

CodeL04
BillableNo — Header code
CategoryDiseases of the skin and subcutaneous tissue (L00-L99)
Excludes15 rule(s)
Excludes20 note(s)
Child codes6

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)