2026 ICD-10-CM Diagnosis Code L25.9Unspecified contact dermatitis, unspecified cause

ICD-10-CM Codes›L00–L99›L20-L30›L25

ICD-10-CM L25.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L25.9 is a billable ICD-10-CM diagnosis code for unspecified 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
L25.9
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified contact dermatitis, unspecified cause
Short Description
Unspecified contact dermatitis, unspecified cause
Same as the full description in the CMS dataset.
Parent Code
L25
Unspecified contact dermatitis

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL20-L30Dermatitis and eczema
CategoryL25Unspecified contact dermatitis
This CodeL25.9Unspecified contact dermatitis, unspecified cause

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute contact dermatitis
  • Chronic contact dermatitis
  • Constitutional discoid hand eczema
  • Contact dermatitis
  • Contact dermatitis of external ear
  • Contact dermatitis of face
  • Contact dermatitis of female genitalia
  • Contact dermatitis of foot
  • Contact dermatitis of hand
  • 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
  • Exogenous dermatitis
  • Exogenous hand eczema
  • Occupational contact dermatitis
  • Occupational contact dermatitis of hand
  • Occupational dermatitis
  • Occupational disorder of upper limb
  • Perianal dermatitis
  • Subacute contact dermatitis
  • Subacute dermatitis

Tabular List NotesGuidance

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

Inclusion Terms

  • Contact dermatitis (occupational) NOS
  • Contact eczema (occupational) 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)

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

  • Occupational Dermatitis

    contact dermatitis associated with allergens or irritants found in the workplace.

  • Allergic Contact Dermatitis

    an inflammatory skin condition caused by an immune response to direct contact between the skin and an allergen. it consists of a delayed type of allergic reaction at the affected site with resulting red, swollen, and blistered skin that may itch or leak.

  • Contact Dermatitis

    an inflammatory skin condition caused by direct contact between the skin and either an irritating substance or an allergen.

  • 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.

  • Primula Dermatitis|Contact dermatitis due to primrose

    allergic contact dermatitis secondary to exposure to organic compounds found in primula (primrose) species.

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 L25.9 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 L25.9Overview

Is L25.9 (Unspecified contact dermatitis) a billable code?

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

What MS-DRG does L25.9 group to?

When unspecified 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 L25.9?

Under the General Equivalence Mappings, unspecified 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.