2026 ICD-10-CM Diagnosis Code L52Erythema nodosum

ICD-10-CM Codes›L00–L99›L49-L54›L52

ICD-10-CM L52
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L52 is a billable ICD-10-CM diagnosis code for erythema nodosum. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 595 through 596. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.

Code Identity

ICD-10-CM Code
L52
Billable Status
Yes — Valid for Submission
Code Describes
Erythema nodosum
Chapter
L49-L54
Urticaria and erythema

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL49-L54Urticaria and erythema
CategoryL52Erythema nodosum
This CodeL52Erythema nodosum

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acne fulminans
  • Acne fulminans with erythema nodosum
  • Acute erythema nodosum
  • Acute panniculitis
  • Chronic erythema nodosum
  • Chronic migratory panniculitis
  • Drug-induced panniculitis
  • Erythema induratum
  • Erythema nodosum
  • Erythema nodosum caused by drug
  • Erythema nodosum due to bacterial infection
  • Erythema nodosum due to coccidioidomycosis
  • Erythema nodosum due to streptococcal infection
  • Erythema nodosum due to systemic fungal infection
  • Erythema nodosum due to Yersinia enterocolitica
  • Erythema nodosum due to yersiniosis
  • Erythema nodosum migrans
  • Lobular panniculitis
  • Sarcoidosis-induced erythema nodosum

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • tuberculous erythema nodosum A18.4

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.

    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • due to or associated with
        • erythema
          • nodosum
    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • in (due to)
        • erythema
          • nodosum
    • Arthropathy
      • in (due to)
        • erythema
          • nodosum
    • Dermatitis(eczematous)
      • contusiformis
    • Erythema, erythematous(infectional) (inflammation)
      • induratum (nontuberculous)
    • Erythema, erythematous(infectional) (inflammation)
      • nodosum

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

Clinical InformationClinical

  • Erythema Nodosum

    an erythematous eruption commonly associated with drug reactions or infection and characterized by inflammatory nodules that are usually tender, multiple, and bilateral. these nodules are located predominantly on the shins with less common occurrence on the thighs and forearms. they undergo characteristic color changes ending in temporary bruise-like areas. this condition usually subsides in 3-6 weeks without scarring or atrophy.

  • Erythema Induratum

    a type of panniculitis characterized histologically by the presence of granulomas, vasculitis, and necrosis. it is traditionally considered to be the tuberculous counterpart of nodular vasculitis, but is now known to occur without tuberculous precedent. it is seen most commonly in adolescent and menopausal women, is initiated or exacerbated by cold weather, and typically presents as one or more recurrent erythrocyanotic nodules or plaques on the calves. the nodules may progress to form indurations, ulcerations, and scars.

Patient EducationClinical

Skin Conditions

Your skin is your body's largest organ. It covers the entire outside of your body. There are many ways that your skin protects your body and helps keep you healthy. For example, it:

The full article covers:

  • What does your skin do?
  • What problems and conditions can affect your skin?
  • How can I keep my skin healthy?

Read the full article at MedlinePlus

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

Convert L52 to ICD-9-CMHistory

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

ICD-9-CM
695.2 Erythema nodosum
Exact Match The mapping is direct, with no qualifiers.

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 L52Overview

Is L52 (Erythema nodosum) a billable code?

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

What MS-DRG does L52 group to?

When erythema nodosum is the principal diagnosis on an inpatient stay, it groups to MS-DRG 595, 596, with relative weights from 1.0825 to 2.1207 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of L52?

Under the General Equivalence Mappings, erythema nodosum converts to ICD-9-CM 695.2 (erythema nodosum). The mapping is a direct match.

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.