2026 ICD-10-CM Diagnosis Code L57.9Skin changes due to chronic exposure to nonionizing radiation, unspecified

ICD-10-CM Codes›L00–L99›L55-L59›L57

ICD-10-CM L57.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L57.9 is a billable ICD-10-CM diagnosis code for skin changes due to chronic exposure to nonionizing radiation, unspecified. 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. Coders also document this condition as skin changes due to chronic exposure to non-ionizing radiation. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Contact dermatitis.

Code Identity

ICD-10-CM Code
L57.9
Billable Status
Yes — Valid for Submission
Code Describes
Skin changes due to chronic exposure to nonionizing radiation, unspecified
Short Description
Skin changes due to chr expsr to nonionizing radiation, unsp
Parent Code
L57
Skin changes due to chronic exposure to nonionizing radiation

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL55-L59Radiation-related disorders of the skin and subcutaneous tissue
CategoryL57Skin changes due to chronic exposure to nonionizing radiation
This CodeL57.9Skin changes due to chronic exposure to nonionizing radiation, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Skin changes due to chronic exposure to non-ionizing radiation
  • Solar comedone
  • Solar degeneration

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.

    • Change(s) (in) (of)
      • skin
        • chronic, due to nonionizing radiation

Clinical ClassificationClinical

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

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

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 L57.9 to ICD-9-CMHistory

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

ICD-9-CM
692.74 Oth chr drmtit solar rad
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 L57.9Overview

Is L57.9 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report skin changes due to chronic exposure to nonionizing radiation, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L57.9 group to?

When skin changes due to chronic exposure to nonionizing radiation, unspecified 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 L57.9?

Under the General Equivalence Mappings, skin changes due to chronic exposure to nonionizing radiation, unspecified converts to ICD-9-CM 692.74 (oth chr drmtit solar rad). 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.