2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B47.9 is a billable ICD-10-CM diagnosis code for mycetoma, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607, 974 through 976. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 8 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B47.9: its own notes plus those printed at B47, block B35-B49, and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Madura foot NOS

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From B47 Mycetoma applies to 3 codes
  • pulmonary mycetoma (J4B)
From Block B35-B49 Mycoses applies to 104 codes
  • hypersensitivity pneumonitis due to organic dust (J67.-)
  • mycosis fungoides (C84.0-)
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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.

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 History & ChangesHistory

Replaced This code was replaced in the FY 2027 code set by:

  • J4B - Pulmonary mycetoma
FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentExpanded into more specific codes in the current code setEffective October 1, 2026 through September 30, 2027.

Questions About B47.9Overview

What is the ICD-10 code for mycetoma, unspecified?

The ICD-10-CM code for mycetoma, unspecified is B47.9 (sometimes written as B479). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does B47.9 group to?

When mycetoma, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 974, 976, 607, 975, 606, with relative weights from 0.7879 to 3.0488 depending on complications. Higher weights mean higher Medicare reimbursement.

Is B47.9 a CC or MCC?

CMS lists B47.9 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 8 closely related codes in its exclusion list.

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.