2026 ICD-10-CM Diagnosis Code B43.0Cutaneous chromomycosis

ICD-10-CM Codes›A00–B99›B35-B49›B43

ICD-10-CM B43.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B43.0 is a billable ICD-10-CM diagnosis code for cutaneous chromomycosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. Coders also document this condition as chromoblastomycosis caused by Fonsecaea compacta. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections and Other specified and unspecified skin disorders.

Code Identity

ICD-10-CM Code
B43.0
Billable Status
Yes — Valid for Submission
Code Describes
Cutaneous chromomycosis
Short Description
Cutaneous chromomycosis
Same as the full description in the CMS dataset.
Parent Code
B43
Chromomycosis and pheomycotic abscess

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB43Chromomycosis and pheomycotic abscess
This CodeB43.0Cutaneous chromomycosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chromoblastomycosis caused by Fonsecaea compacta
  • Cutaneous chromoblastomycosis
  • Cutaneous chromoblastomycotic abscess
  • Infection by Cladosporium carrionii
  • Infection by Fonsecaea pedrosoi
  • Infection by Phialophora verrucosa
  • Lymphocutaneous chromoblastomycosis
  • Primary chromoblastomycotic nodule

Tabular List NotesGuidance

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

Inclusion Terms

  • Dermatitis verrucosa

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.

    • Chromomycosis
      • cutaneous
    • Chromomycosis
      • skin
    • Dermatitis(eczematous)
      • verrucosa
    • Infection, infected, infective(opportunistic)
      • Cladosporium
        • carrionii
    • Infection, infected, infective(opportunistic)
      • Fonsecaea (compactum) (pedrosoi)
    • Infection, infected, infective(opportunistic)
      • Phialophora
        • verrucosa (skin)

Clinical ClassificationClinical

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

CCSR INF004
Fungal infections
Default principal diagnosis: inpatient No · outpatient No
CCSR SKN007
Other specified and unspecified skin disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Fungal Infections

If you have ever had athlete's foot or a yeast infection, you can blame a fungus. A fungus is a primitive organism. Mushrooms, mold and mildew are examples. Fungi live in air, in soil, on plants and in water. Some live in the human body. Only about half of all types of fungi are harmful.

Read the full article at MedlinePlus

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

Convert B43.0 to ICD-9-CMHistory

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

ICD-9-CM
117.2 Chromoblastomycosis
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 B43.0Overview

Is B43.0 (Chromomycosis and pheomycotic abscess) a billable code?

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

What MS-DRG does B43.0 group to?

When cutaneous chromomycosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B43.0?

Under the General Equivalence Mappings, cutaneous chromomycosis converts to ICD-9-CM 117.2 (chromoblastomycosis). 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.