L04 Acute lymphadenitis

Category / Non-billable header 6 subcodes

Block: Infections of the skin and subcutaneous tissue (L00-L08)

Includes

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

Excludes 1 (cannot be coded together)

  • 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)

Subcodes

Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.

Code Description Billable
L04..0 Acute lymphadenitis of face, head and neck Yes
L04..1 Acute lymphadenitis of trunk Yes
L04..2 Acute lymphadenitis of upper limb Yes
L04..3 Acute lymphadenitis of lower limb Yes
L04..8 Acute lymphadenitis of other sites Yes
L04..9 Acute lymphadenitis, unspecified Yes

Last reviewed: September 2026