2026 ICD-10-CM Diagnosis Code L02.222Furuncle of back [any part, except buttock and flank]

ICD-10-CM Codes›L00–L99›L00-L08›L02

ICD-10-CM L02.222
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L02.222 is a billable ICD-10-CM diagnosis code for furuncle of back [any part, except buttock and flank]. 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 boil of back. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin and subcutaneous tissue infections.

Code Identity

ICD-10-CM Code
L02.222
Billable Status
Yes — Valid for Submission
Code Describes
Furuncle of back [any part, except buttock and flank]
Short Description
Furuncle of back [any part, except buttock and flank]
Same as the full description in the CMS dataset.
Parent Code
L02.22
Furuncle of trunk

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL00-L08Infections of the skin and subcutaneous tissue
CategoryL02Cutaneous abscess, furuncle and carbuncle
This CodeL02.222Furuncle of back [any part, except buttock and flank]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Boil of back

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Furuncle
      • back (any part except buttock and flank)
    • Furuncle
      • trunk
        • back

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 L02.222 to ICD-9-CMHistory

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

ICD-9-CM
680.2 Carbuncle of trunk
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Revised Code L02.222 was revised for FY 2026, effective October 1, 2025.

Replaced This code was replaced in the FY 2026 code set by:

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

Questions About L02.222Overview

Is L02.222 (Furuncle of trunk) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report furuncle of back [any part, except buttock and flank] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L02.222 group to?

When furuncle of back [any part, except buttock and flank] 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 L02.222?

Under the General Equivalence Mappings, furuncle of back [any part, except buttock and flank] converts to ICD-9-CM 680.2 (carbuncle of trunk). 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.