NPI Atlas

B43.9 – Chromomycosis, unspecified

ICD-10-CM 2027 diagnosis code · Mycoses

Billable code

ICD-10-CM code B43.9

Code: B43.9 (claims format: B439)
Description: Chromomycosis, unspecified
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: B35-B49 Mycoses
Parent codes: B43

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block B35-B49

Excludes2 (not included here):

hypersensitivity pneumonitis due to organic dust (J67.-)
mycosis fungoides (C84.0-)

Index terms for B43.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Chromomycosis

Related codes in B43

B43.0 – Cutaneous chromomycosisBillable
B43.1 – Pheomycotic brain abscessBillable
B43.2 – Subcutaneous pheomycotic abscess and cystBillable
B43.8 – Other forms of chromomycosisBillable

Frequently asked questions

What is ICD-10 code B43.9?

B43.9 is the ICD-10-CM code for chromomycosis, unspecified, in the block B35-B49 (Mycoses).

Is B43.9 a billable code?

Yes. B43.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does B43.9 belong to?

It belongs to category B43 – Chromomycosis and pheomycotic abscess.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.