2026 ICD-10-CM Diagnosis Code L43.0Hypertrophic lichen planus

ICD-10-CM Codes›L00–L99›L40-L45›L43

ICD-10-CM L43.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L43.0 is a billable ICD-10-CM diagnosis code for hypertrophic lichen planus. 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 eruption of female perineum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.

Code Identity

ICD-10-CM Code
L43.0
Billable Status
Yes — Valid for Submission
Code Describes
Hypertrophic lichen planus
Short Description
Hypertrophic lichen planus
Same as the full description in the CMS dataset.
Parent Code
L43
Lichen planus

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL40-L45Papulosquamous disorders
CategoryL43Lichen planus
This CodeL43.0Hypertrophic lichen planus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Eruption of female perineum
  • Eruption of vulva
  • Genital lichen planus
  • Hypertrophic lichen planus
  • Hypertrophic oral lichen planus
  • Hypertrophic vulval lichen planus
  • Hypertrophy of vulva
  • Lichen planus of vulva

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.

    • Lichen
      • planus (chronicus)
        • hypertrophic

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

  • Hypertrophic Lichen Planus

    a form of lichen planus that is characterized by plaques of markedly thickened skin that is often extremely pruritic and localized to the lower legs. it can result in permanent pigmentation and scarring.

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 L43.0 to ICD-9-CMHistory

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

ICD-9-CM
697.0 Lichen planus
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 L43.0Overview

Is L43.0 (Lichen planus) a billable code?

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

What MS-DRG does L43.0 group to?

When hypertrophic lichen planus 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 L43.0?

Under the General Equivalence Mappings, hypertrophic lichen planus converts to ICD-9-CM 697.0 (lichen planus). 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.