2026 ICD-10-CM Diagnosis Code L03.031Cellulitis of right toe

ICD-10-CM Codes›L00–L99›L00-L08›L03

ICD-10-CM L03.031
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L03.031 is a billable ICD-10-CM diagnosis code for cellulitis of right toe. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin and subcutaneous tissue infections.

Code Identity

ICD-10-CM Code
L03.031
Billable Status
Yes — Valid for Submission
Code Describes
Cellulitis of right toe
Short Description
Cellulitis of right toe
Same as the full description in the CMS dataset.
Parent Code
L03.03
Cellulitis of toe

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL00-L08Infections of the skin and subcutaneous tissue
CategoryL03Cellulitis and acute lymphangitis
This CodeL03.031Cellulitis of right toe

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral paronychia of toe of feet
  • Cellulitis of all toes of right foot
  • Cellulitis of fourth toe
  • Cellulitis of great toe
  • Cellulitis of little toe
  • Cellulitis of right foot
  • Cellulitis of right fourth toe
  • Cellulitis of right great toe
  • Cellulitis of right little toe
  • Cellulitis of right second toe
  • Cellulitis of right third toe
  • Cellulitis of second toe
  • Cellulitis of third toe
  • Cellulitis of toe of right foot
  • Onychia
  • Onychia of toe
  • Onychia of toe of right foot
  • Paronychia due to ingrown nail
  • Paronychia of toe
  • Paronychia of toe of left foot
  • Paronychia of toe of right foot
  • Paronychia of toe of right foot due to ingrown toenail

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 L03.031 to ICD-9-CMHistory

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

ICD-9-CM
681.10 Cellulitis, toe NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
681.11 Onychia of toe
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 L03.031Overview

Is L03.031 (Cellulitis of toe) a billable code?

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

What MS-DRG does L03.031 group to?

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

What is the ICD-9 equivalent of L03.031?

Under the General Equivalence Mappings, cellulitis of right toe converts to ICD-9-CM 681.10 (cellulitis, toe NOS) and 681.11 (onychia of toe). 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.