2026 ICD-10-CM Diagnosis Code B47.1Actinomycetoma

ICD-10-CM Codes›A00–B99›B35-B49›B47

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

B47.1 is a billable ICD-10-CM diagnosis code for actinomycetoma. 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, 974 through 976. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B47.1
Billable Status
Yes — Valid for Submission
Code Describes
Actinomycetoma
Short Description
Actinomycetoma
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 CodeB47.1Actinomycetoma

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Actinomycetoma caused by Actinomadura madurae
  • Actinomycetoma caused by Actinomadura pelletieri
  • Actinomycetoma caused by Nocardia
  • Actinomycetoma caused by Nocardia otitidis caviarum
  • Actinomycetoma caused by Streptomyces somaliensis
  • Actinomycotic madura foot
  • Actinomycotic mycetoma
  • Madura foot caused by Actinomadura pelletieri
  • Madura foot caused by Streptomyces
  • Madura foot caused by Streptomyces somaliensis
  • Mycetoma of foot

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.

    • Actinomycetoma(foot)
    • Infection, infected, infective(opportunistic)
      • Actinomadura
    • Infection, infected, infective(opportunistic)
      • mycetoma
        • actinomycotic NEC
    • Infection, infected, infective(opportunistic)
      • Streptomyces
    • Madura
      • foot
        • actinomycotic
    • Mycetoma
      • actinomycotic
    • Mycetoma
      • foot
        • actinomycotic
    • Mycetoma
      • nocardial
    • Streptomycosis

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

  • Actinomycetoma

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

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 B47.1 to ICD-9-CMHistory

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

ICD-9-CM
039.9 Actinomycosis 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 B47.1Overview

Is B47.1 (Mycetoma) a billable code?

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

What MS-DRG does B47.1 group to?

When actinomycetoma is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, 974, 975, 976, with relative weights from 0.7297 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B47.1?

Under the General Equivalence Mappings, actinomycetoma converts to ICD-9-CM 039.9 (actinomycosis 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.