2026 ICD-10-CM Diagnosis Code L98.3Eosinophilic cellulitis [Wells]

ICD-10-CM Codes›L00–L99›L80-L99›L98

ICD-10-CM L98.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L98.3 is a billable ICD-10-CM diagnosis code for eosinophilic cellulitis [Wells]. 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 43 closely related codes. Coders also document this condition as disorder of eosinophil. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.

Code Identity

ICD-10-CM Code
L98.3
Billable Status
Yes — Valid for Submission
Code Describes
Eosinophilic cellulitis [Wells]
Short Description
Eosinophilic cellulitis [Wells]
Same as the full description in the CMS dataset.
Parent Code
L98
Other disorders of skin and subcutaneous tissue, not elsewhere classified

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL80-L99Other disorders of the skin and subcutaneous tissue
CategoryL98Other disorders of skin and subcutaneous tissue, not elsewhere classified
This CodeL98.3Eosinophilic cellulitis [Wells]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Disorder of eosinophil
  • Eosinophilic cellulitis

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 SKN002
Other specified inflammatory condition of skin
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 L98.3 to ICD-9-CMHistory

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

ICD-9-CM
682.9 Cellulitis NOS
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 L98.3Overview

What is the ICD-10 code for eosinophilic cellulitis [Wells]?

The ICD-10-CM code for eosinophilic cellulitis [Wells] is L98.3 (sometimes written as L983). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is L98.3 a billable code?

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

What MS-DRG does L98.3 group to?

When eosinophilic cellulitis [Wells] 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 L98.3 a CC or MCC?

CMS lists L98.3 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 43 closely related codes in its exclusion list.

What is the ICD-9 equivalent of L98.3?

Under the General Equivalence Mappings, eosinophilic cellulitis [Wells] converts to ICD-9-CM 682.9 (cellulitis NOS). The mapping is approximate, so confirm the match fits the documentation.