2026 ICD-10-CM Diagnosis Code B47.9Mycetoma, unspecified

ICD-10-CM Codes›A00–B99›B35-B49›B47

ICD-10-CM B47.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B47.9 is a billable ICD-10-CM diagnosis code for mycetoma, 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, 974 through 976. Coders also document this condition as fusarium infection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B47.9
Billable Status
Yes — Valid for Submission
Code Describes
Mycetoma, unspecified
Short Description
Mycetoma, unspecified
Same as the full description in the CMS dataset.
Parent Code
B47
Mycetoma

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB47Mycetoma
This CodeB47.9Mycetoma, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Fusarium infection
  • Mycetoma
  • Mycetoma caused by Fusarium
  • Mycetoma of foot

Tabular List NotesGuidance

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

Inclusion Terms

  • Madura foot 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.

    • Infection, infected, infective(opportunistic)
      • mycetoma
    • Madura
      • foot
    • Mycetoma
    • Mycetoma
      • bone (mycotic)
    • Mycetoma
      • foot
    • Mycetoma
      • madurae NEC

Clinical ClassificationClinical

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

CCSR INF004
Fungal infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Mycetoma

    a chronic progressive subcutaneous infection caused by species of fungi (eumycetoma), or actinomycetes (actinomycetoma). it is characterized by tumefaction, abscesses, and tumor-like granules representing microcolonies of pathogens, such as madurella fungi and bacteria actinomycetes, with different grain colors.

  • Actinomycetoma

    a chronic granulomatous inflammation involving the deep dermis and the subcutaneous tissues. it is caused by actinomycetes bacteria.

  • Madurella mycetomatis|MADURELLA MYCETOMATIS|Madurella ikedae|Madurella mycetomi|Streptotrix mycetomatis

    a species of fungi in the phylum ascomycota characterized by brown diffusible pigment that is produced in primary cultures and the occasional presence of phialides. this species is a causative agent of eumycetoma.

  • Mycetoma

    a chronic granulomatous inflammation involving the deep dermis and the subcutaneous tissues. it is caused by fungi and actinomycetes.

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 B47.9 to ICD-9-CMHistory

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

ICD-9-CM
039.4 Madura foot
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 B47.9Overview

Is B47.9 (Mycetoma) a billable code?

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

What MS-DRG does B47.9 group to?

When mycetoma, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, 974, 975, 976, with relative weights from 0.8945 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B47.9?

Under the General Equivalence Mappings, mycetoma, unspecified converts to ICD-9-CM 039.4 (madura foot). 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.