2026 ICD-10-CM Diagnosis Code L04.3Acute lymphadenitis of lower limb
ICD-10-CM Codes›L00–L99›L00-L08›L04
- Billable — Valid for Submission
- Not Chronic
L04.3 is a billable ICD-10-CM diagnosis code for acute lymphadenitis of lower limb. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 791, 793, 814 through 816. Coders also document this condition as acute inguinal lymphadenitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin and subcutaneous tissue infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute inguinal lymphadenitis
- Acute lymphadenitis of inguinal lymph nodes
- Acute lymphadenitis of lower limb
- Inguinal lymphadenopathy
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Acute lymphadenitis of hip
Type 2 Excludes
- acute lymphadenitis of groin L04.1
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Acute Lymphadenitis
acute inflammation of the lymph nodes.
Patient EducationClinical
Lymphatic Diseases
The lymphatic system is a network of tissues and organs. It is made up of:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert L04.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L04.3Overview
What is the ICD-10 code for acute lymphadenitis of lower limb?
The ICD-10-CM code for acute lymphadenitis of lower limb is L04.3 (sometimes written as L043). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is L04.3 (Acute lymphadenitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report acute lymphadenitis of lower limb on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does L04.3 group to?
When acute lymphadenitis of lower limb is the principal diagnosis on an inpatient stay, it groups to MS-DRG 791, 793, 814, 815, 816, with relative weights from 0.6320 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of L04.3?
Under the General Equivalence Mappings, acute lymphadenitis of lower limb converts to ICD-9-CM 683 (acute lymphadenitis). The mapping is approximate, so confirm the match fits the documentation.
