L04
⚠ Non-billable
Acute lymphadenitis
ICD-10-CM · FY2026 · Diseases of the Skin and Subcutaneous Tissue
Code
L04
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Skin and Subcutaneous Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Includes
- abscess (acute) of lymph nodes, except mesenteric
- acute lymphadenitis, except mesenteric
Excludes1 — never code 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)
Frequently asked questions
What is ICD-10 code L04?
ICD-10-CM code L04 represents Acute lymphadenitis. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Skin and Subcutaneous Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is L04 billable?
No. L04 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is L04 in?
L04 belongs to the Diseases of the Skin and Subcutaneous Tissue chapter (L00–L99) of ICD-10-CM.
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