2027 ICD-10-CM Diagnosis Code B46Zygomycosis

ICD-10-CM Codes›A00–B99›B35-B49›B46

ICD-10-CM B46
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B46 is a non-billable ICD-10-CM category code for zygomycosis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B46.0, B46.1, B46.2, and B46.3.

Code Identity

ICD-10-CM Code
B46
Billable Status
No — Non-Billable Category
Code Describes
Zygomycosis
Short Description
Zygomycosis
Same as the full description in the CMS dataset.
Chapter
B35-B49
Mycoses

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB46Zygomycosis
This CodeB46Zygomycosis

Specific Coding for ZygomycosisOverview

Non-specific codes like B46 require more characters. Use one of these billable codes instead:

  • Use B46.0 for Pulmonary mucormycosis

  • Use B46.1 for Rhinocerebral mucormycosis

  • Use B46.2 for Gastrointestinal mucormycosis

  • Use B46.3 for Cutaneous mucormycosis

  • Use B46.4 for Disseminated mucormycosis

  • Use B46.5 for Mucormycosis, unspecified

  • Use B46.8 for Other zygomycoses

  • Use B46.9 for Zygomycosis, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B46: its own notes plus those printed at 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

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 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.

Clinical InformationClinical

  • Zygomycosis

    infection in humans and animals caused by fungi in the class zygomycetes. it includes mucormycosis and entomophthoramycosis. the latter is a tropical infection of subcutaneous tissue or paranasal sinuses caused by fungi in the order entomophthorales. phycomycosis, closely related to zygomycosis, describes infection with members of phycomycetes, an obsolete classification.

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B46Overview

What is the ICD-10 code for zygomycosis?

B46 is the ICD-10-CM category for zygomycosis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is B46 (Zygomycosis) a billable code?

No. This is a category header that groups the codes for zygomycosis, and headers cannot be submitted on claims. Claims for zygomycosis need a more specific code from this category, such as B46.0, B46.1, and B46.2.