2026 ICD-10-CM Diagnosis Code L03.129Acute lymphangitis of unspecified part of limb

ICD-10-CM Codes›L00–L99›L00-L08›L03

ICD-10-CM L03.129
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L03.129 is a billable ICD-10-CM diagnosis code for acute lymphangitis of unspecified part of limb. 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 52 closely related codes. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin and subcutaneous tissue infections.

Code Identity

ICD-10-CM Code
L03.129
Billable Status
Yes — Valid for Submission
Code Describes
Acute lymphangitis of unspecified part of limb
Short Description
Acute lymphangitis of unspecified part of limb
Same as the full description in the CMS dataset.
Parent Code
L03.12
Acute lymphangitis of other parts of limb

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL00-L08Infections of the skin and subcutaneous tissue
CategoryL03Cellulitis and acute lymphangitis
This CodeL03.129Acute lymphangitis of unspecified part of limb

Code EditsBilling

Medicare Code Editor checks that affect claim validity for L03.129.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute lymphangitis of ankle
  • Acute lymphangitis of axilla
  • Acute lymphangitis of foot
  • Acute lymphangitis of forearm
  • Acute lymphangitis of hand
  • Acute lymphangitis of heel
  • Acute lymphangitis of hip
  • Acute lymphangitis of knee
  • Acute lymphangitis of lower limb
  • Acute lymphangitis of shoulder
  • Acute lymphangitis of thigh
  • Acute lymphangitis of trunk
  • Acute lymphangitis of upper arm
  • Acute lymphangitis of wrist

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 L03.129 to ICD-9-CMHistory

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

ICD-9-CM
682.3 Cellulitis of arm
Approximate The match is approximate rather than exact.
ICD-9-CM
682.4 Cellulitis of hand
Approximate The match is approximate rather than exact.
ICD-9-CM
682.6 Cellulitis of leg
Approximate The match is approximate rather than exact.
ICD-9-CM
682.7 Cellulitis of foot
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 L03.129Overview

What is the ICD-10 code for acute lymphangitis of unspecified part of limb?

The ICD-10-CM code for acute lymphangitis of unspecified part of limb is L03.129 (sometimes written as L03129). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is L03.129 (Acute lymphangitis of other parts of limb) a billable code?

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

What MS-DRG does L03.129 group to?

When acute lymphangitis of unspecified part of limb 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 L03.129 a CC or MCC?

CMS lists L03.129 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 52 closely related codes in its exclusion list.

What is the ICD-9 equivalent of L03.129?

Under the General Equivalence Mappings, acute lymphangitis of unspecified part of limb converts to ICD-9-CM 682.3 (cellulitis of arm), 682.4 (cellulitis of hand), and 682.6 (cellulitis of leg). The mapping is approximate, so confirm the match fits the documentation.