2026 ICD-10-CM Diagnosis Code B43Chromomycosis and pheomycotic abscess

ICD-10-CM Codes›A00–B99›B35-B49›B43

ICD-10-CM B43
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B43 is a non-billable ICD-10-CM category code for chromomycosis and pheomycotic abscess, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B43.0, B43.1, B43.2, and B43.8.

Code Identity

ICD-10-CM Code
B43
Billable Status
No — Non-Billable Category
Code Describes
Chromomycosis and pheomycotic abscess
Chapter
B35-B49
Mycoses

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB43Chromomycosis and pheomycotic abscess
This CodeB43Chromomycosis and pheomycotic abscess

Specific Coding for Chromomycosis and pheomycotic abscessOverview

Non-specific codes like B43 require more characters. Use one of these billable codes instead:

  • Use B43.0 for Cutaneous chromomycosis

  • Use B43.1 for Pheomycotic brain abscess

  • Use B43.2 for Subcutaneous pheomycotic abscess and cyst

  • Use B43.8 for Other forms of chromomycosis

  • Use B43.9 for Chromomycosis, unspecified

Patient EducationClinical

Abscess

An abscess is a pocket of pus. You can get an abscess almost anywhere in your body. When an area of your body becomes infected, your body's immune system tries to fight the infection. White blood cells go to the infected area, collect within the damaged tissue, and cause inflammation. During this process, pus forms.

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 B43Overview

Is B43 (Chromomycosis and pheomycotic abscess) a billable code?

No. This is a category header that groups the codes for chromomycosis and pheomycotic abscess, and headers cannot be submitted on claims. Claims for chromomycosis and pheomycotic abscess need a more specific code from this category, such as B43.0, B43.1, and B43.2.