2026 ICD-10-CM Diagnosis Code B46Zygomycosis

ICD-10-CM Codes›A00–B99›B35-B49›B46

ICD-10-CM B46
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

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
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

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.

  • Mucormycosis

    infection in humans and animals caused by any fungus in the order mucorales (e.g., rhizopus; mucor; cunninghamella; apophysomyces; absidia; saksenaea and rhizomucor) there are many clinical types associated with infection including central nervous system, lung, gastrointestinal tract, skin, orbit and paranasal sinuses. in humans, it usually occurs as an opportunistic infection.

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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B46Overview

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.