2027 ICD-10-CM Diagnosis Code B43.9Chromomycosis, unspecified
ICD-10-CM Codes›A00–B99›B35-B49›B43
- Billable — Valid for Submission
- Not Chronic
B43.9 is a billable ICD-10-CM diagnosis code for chromomycosis, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. Coders also document this condition as cladosporiosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Cladosporiosis
- Phaeohyphomycosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B43.9: 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.
- 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.
- 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.
- 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.
Chromomycosis B43.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Chromoblastomycosis
scaly papule or warty growth, caused by five fungi, that spreads as a result of satellite lesions affecting the foot or leg. the extremity may become swollen and, at its distal portion, covered with various nodular, tumorous, verrucous lesions that resemble cauliflower. in rare instances, the disease may begin on the hand or wrist and involve the entire upper extremity. (arnold, odom, and james, andrew's diseases of the skin, 8th ed, p362)
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 B43.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B43.9Overview
What is the ICD-10 code for chromomycosis, unspecified?
The ICD-10-CM code for chromomycosis, unspecified is B43.9 (sometimes written as B439). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B43.9 (Chromomycosis and pheomycotic abscess) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report chromomycosis, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B43.9 group to?
When chromomycosis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of B43.9?
Under the General Equivalence Mappings, chromomycosis, unspecified converts to ICD-9-CM 117.2 (chromoblastomycosis). The mapping is approximate, so confirm the match fits the documentation.
