2026 ICD-10-CM Diagnosis Code L03.323Acute lymphangitis of chest wall

ICD-10-CM Codes›L00–L99›L00-L08›L03

ICD-10-CM L03.323
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L03.323 is a billable ICD-10-CM diagnosis code for acute lymphangitis of chest wall. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 573 through 575, 602 through 603, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 67 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin and subcutaneous tissue infections.

Code Identity

ICD-10-CM Code
L03.323
Billable Status
Yes — Valid for Submission
Code Describes
Acute lymphangitis of chest wall
Short Description
Acute lymphangitis of chest wall
Same as the full description in the CMS dataset.
Parent Code
L03.32
Acute lymphangitis of trunk

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL00-L08Infections of the skin and subcutaneous tissue
CategoryL03Cellulitis and acute lymphangitis
This CodeL03.323Acute lymphangitis of chest wall

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute lymphangitis of chest wall
  • Acute lymphangitis of pectoral region
  • Acute lymphangitis of trunk

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SKN001
Skin and subcutaneous tissue infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Bacterial Infections

Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.

The full article covers:

  • What are bacteria?
  • How do bacterial infections spread?
  • What are the treatments for bacterial infections?
  • Can bacterial infections be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert L03.323 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
682.2 Cellulitis of trunk
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L03.323Overview

What is the ICD-10 code for acute lymphangitis of chest wall?

The ICD-10-CM code for acute lymphangitis of chest wall is L03.323 (sometimes written as L03323). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is L03.323 (Acute lymphangitis of trunk) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute lymphangitis of chest wall on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L03.323 group to?

When acute lymphangitis of chest wall is the principal diagnosis on an inpatient stay, it groups to MS-DRG 573, 574, 575, 602, 603, 791, 793, with relative weights from 0.8709 to 6.5514 depending on complications. Higher weights mean higher Medicare reimbursement.

Is L03.323 a CC or MCC?

CMS lists L03.323 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 67 closely related codes in its exclusion list.

What is the ICD-9 equivalent of L03.323?

Under the General Equivalence Mappings, acute lymphangitis of chest wall converts to ICD-9-CM 682.2 (cellulitis of trunk). The mapping is approximate, so confirm the match fits the documentation.