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L04

Non-billable

Acute lymphadenitis

L04 is the ICD-10-CM code for Acute lymphadenitis. It is a non-billable category code — use a more specific child code such as L04.0 for billing.

Status
Header (non-billable)
Chapter
L00-L99
Subcodes
6
Edition
FY2026

L00-L99 Diseases of the skin and subcutaneous tissue

Includes

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

Excludes1 — not coded here

  • •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?
L04 is the ICD-10-CM code for "Acute lymphadenitis". It falls under L00-L99 Diseases of the skin and subcutaneous tissue.
Is L04 a billable code?
No — L04 is a non-billable header code. Use a more specific child code (such as L04.0) for billing.
What are the subcodes of L04?
L04 has 6 more specific child codes, including L04.0, L04.1, L04.2.
What is excluded from L04?
Excludes1 (not coded here): 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).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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