L04Header code — not billable

Acute lymphadenitis

Chapter
12. Diseases of the skin and subcutaneous tissue
Category
L04
Effective date
October 1, 2026

Related codes in category L04

L04.0Acute lymphadenitis of face, head and neckYesL04.1Acute lymphadenitis of trunkYesL04.2Acute lymphadenitis of upper limbYesL04.3Acute lymphadenitis of lower limbYesL04.8Acute lymphadenitis of other sitesYesL04.9Acute lymphadenitis, unspecifiedYes

Frequently asked questions

What is ICD-10 code L04?

L04 is an ICD-10-CM diagnosis code for Acute lymphadenitis.

Is L04 a billable code?

No. L04 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is L04 in?

L04 falls under Chapter 12: Diseases of the skin and subcutaneous tissue.

When did L04 become effective?

L04 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to L04?

L04 belongs to category L04, which includes 6 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.