2026 ICD-10-CM Diagnosis Code L24.9Irritant contact dermatitis, unspecified cause

ICD-10-CM Codes›L00–L99›L20-L30›L24

ICD-10-CM L24.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L24.9 is a billable ICD-10-CM diagnosis code for irritant contact dermatitis, unspecified cause. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Contact dermatitis.

Code Identity

ICD-10-CM Code
L24.9
Billable Status
Yes — Valid for Submission
Code Describes
Irritant contact dermatitis, unspecified cause
Short Description
Irritant contact dermatitis, unspecified cause
Same as the full description in the CMS dataset.
Parent Code
L24
Irritant contact dermatitis

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL20-L30Dermatitis and eczema
CategoryL24Irritant contact dermatitis
This CodeL24.9Irritant contact dermatitis, unspecified cause

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute contact dermatitis
  • Acute irritant contact dermatitis
  • Acute irritant contact dermatitis of hand
  • Chronic contact dermatitis
  • Chronic irritant contact dermatitis
  • Chronic irritant contact dermatitis of hands
  • Complication of colostomy
  • Contact dermatitis of external ear
  • Contact dermatitis of female genitalia
  • Contact dermatitis of foot
  • Contact dermatitis of lower leg
  • Contact dermatitis of male genitalia
  • Contact dermatitis of neck
  • Contact dermatitis of perianal skin
  • Contact dermatitis of scalp
  • Contact dermatitis of skin of left hand
  • Contact dermatitis of skin of right hand
  • Exacerbation of constitutional dermatitis due to occupation
  • Exacerbation of constitutional dermatitis due to occupational exposure to skin irritant
  • Irritant contact dermatitis
  • Irritant contact dermatitis due to colostomy
  • Irritant contact dermatitis due to stoma
  • Irritant contact dermatitis of external ear
  • Irritant contact dermatitis of face
  • Irritant contact dermatitis of female genitalia
  • Irritant contact dermatitis of foot
  • Irritant contact dermatitis of hand
  • Irritant contact dermatitis of lower leg
  • Irritant contact dermatitis of male genitalia
  • Irritant contact dermatitis of neck
  • Irritant contact dermatitis of scalp
  • Occupational irritant contact dermatitis
  • Perianal dermatitis
  • Perianal irritant contact dermatitis
  • Peristomal dermatitis
  • Peristomal skin complication
  • Subacute contact dermatitis
  • Subacute dermatitis
  • Subacute irritant contact dermatitis

Tabular List NotesGuidance

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

Inclusion Terms

  • Irritant contact eczema NOS

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.

    • Dermatitis(eczematous)
      • contact (occupational)
        • irritant
    • Dermatitis(eczematous)
      • due to
        • external irritant NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SKN005
Contact dermatitis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Irritant Contact Dermatitis

    an inflammatory skin condition caused by direct contact between the skin and an irritating substance. it is typically manifested by erythema, mild edema, and scaling at the affected site.

Patient EducationClinical

Rashes

A rash is an area of irritated or swollen skin. Many rashes are itchy, red, painful, and irritated. Some rashes can also lead to blisters or patches of raw skin. Rashes are a symptom of many different medical problems. Other causes include irritating substances and allergies. Certain genes can make people more likely to get rashes.

Read the full article at MedlinePlus

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

Convert L24.9 to ICD-9-CMHistory

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

ICD-9-CM
692.9 Dermatitis 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 L24.9Overview

Is L24.9 (Irritant contact dermatitis) a billable code?

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

What MS-DRG does L24.9 group to?

When irritant contact dermatitis, unspecified cause is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of L24.9?

Under the General Equivalence Mappings, irritant contact dermatitis, unspecified cause converts to ICD-9-CM 692.9 (dermatitis NOS). 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.