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

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
Short Description
Chromomycosis and pheomycotic abscess
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B43: 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.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B43Overview

What is the ICD-10 code for chromomycosis and pheomycotic abscess?

B43 is the ICD-10-CM category for chromomycosis and pheomycotic abscess, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.