2026 ICD-10-CM Diagnosis Code L02.423Furuncle of right upper limb

ICD-10-CM Codes›L00–L99›L00-L08›L02

ICD-10-CM L02.423
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L02.423 is a billable ICD-10-CM diagnosis code for furuncle of right upper limb. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 602 through 603. Coders also document this condition as furuncle of forearm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin and subcutaneous tissue infections.

Code Identity

ICD-10-CM Code
L02.423
Billable Status
Yes — Valid for Submission
Code Describes
Furuncle of right upper limb
Short Description
Furuncle of right upper limb
Same as the full description in the CMS dataset.
Parent Code
L02.42
Furuncle of limb

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL00-L08Infections of the skin and subcutaneous tissue
CategoryL02Cutaneous abscess, furuncle and carbuncle
This CodeL02.423Furuncle of right upper limb

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Furuncle of forearm
  • Furuncle of right forearm
  • Furuncle of right shoulder
  • Furuncle of right upper limb
  • Furuncle of right wrist
  • Furuncle of shoulder
  • Furuncle 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

Skin Infections

Your skin is your body's largest organ. It has many different functions, including covering and protecting your body. It helps keep germs out. But sometimes the germs can cause a skin infection. It often happens when the germs enter your body through a break, cut, or wound on your skin.

The full article covers:

  • What are skin infections?
  • What causes skin infections?
  • Who is more likely to get a skin infection?
  • What are the symptoms of skin infections?
  • How are skin infections diagnosed?
  • How are skin infections treated?

Read the full article at MedlinePlus

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

Convert L02.423 to ICD-9-CMHistory

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

ICD-9-CM
680.3 Carbuncle of arm
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 L02.423Overview

Is L02.423 (Furuncle of limb) a billable code?

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

What MS-DRG does L02.423 group to?

When furuncle of right upper limb is the principal diagnosis on an inpatient stay, it groups to MS-DRG 602, 603, with relative weights from 0.8709 to 1.4213 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of L02.423?

Under the General Equivalence Mappings, furuncle of right upper limb converts to ICD-9-CM 680.3 (carbuncle of arm). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.