2026 ICD-10-CM Diagnosis Code L03.313Cellulitis of chest wall

ICD-10-CM Codes›L00–L99›L00-L08›L03

ICD-10-CM L03.313
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L03.313 is a billable ICD-10-CM diagnosis code for cellulitis 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. Coders also document this condition as abscess of chest wall. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin and subcutaneous tissue infections.

Code Identity

ICD-10-CM Code
L03.313
Billable Status
Yes — Valid for Submission
Code Describes
Cellulitis of chest wall
Short Description
Cellulitis of chest wall
Same as the full description in the CMS dataset.
Parent Code
L03.31
Cellulitis 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 CodeL03.313Cellulitis of chest wall

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of chest wall
  • Cellulitis and abscess of chest wall
  • Cellulitis and abscess of trunk
  • Cellulitis of chest wall
  • Cellulitis of pectoral region

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

Cellulitis

Cellulitis is an infection of the skin and deep underlying tissues. Group A strep (streptococcal) bacteria are the most common cause. The bacteria enter your body when you get an injury such as a bruise, burn, surgical cut, or wound.

Read the full article at MedlinePlus

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

Convert L03.313 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 L03.313Overview

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

The ICD-10-CM code for cellulitis of chest wall is L03.313 (sometimes written as L03313). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is L03.313 (Cellulitis of trunk) a billable code?

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

What MS-DRG does L03.313 group to?

When cellulitis 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 L03.313 a CC or MCC?

CMS lists L03.313 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 L03.313?

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