Acute lymphadenitis (L04) ICD-10-CM
The L04 code range covers acute lymphadenitis with 7 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- abscess (acute) of lymph nodes, except mesenteric
- acute lymphadenitis, except mesenteric
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the L04 Range 7 codes · 6 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the L04 range.
Acute Lymphadenitis
Acute inflammation of the lymph nodes.
About the L04 Code Range
Acute lymphadenitis is acute inflammation of the lymph nodes. It sits within the group for infections of the skin and tissue beneath it.
The subdivisions separate cases by location: L04.0 for the face, head and neck; L04.1 for the trunk; L04.2 for an upper limb; and L04.3 for a lower limb. L04.8 identifies other sites, while L04.9 leaves the site unspecified.
Questions About This Page
How many billable codes are in the L04 range?
Of the 7 codes in this range, 6 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the L04 range classify?
The range classifies acute lymphadenitis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
