Chromomycosis and pheomycotic abscess (B43) ICD-10-CM
The B43 code range covers chromomycosis and pheomycotic abscess with 6 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the B43 Range 6 codes · 5 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B43 range.
Cerebral Phaeohyphomycosis
CNS infections caused by neurotropic dematiaceous fungi that contain melanin in their cell walls. The infections often result in BRAIN ABSCESS; ENCEPHALITIS; and MENINGITIS in patients who are often immunocompetent. The common causative fungi include members Cladophialophora bantiana, Exophiala dermatitidis, Rhinocladiella mackenziei, and Ochroconis gallopavum. R. mackenziei infection is seen almost exclusively in patients from the MIDDLE EAST.
Phaeohyphomycosis
OPPORTUNISTIC INFECTIONS caused by the dematiaceous (darkly pigmented) MITOSPORIC FUNGI of ALTERNARIA, Bipolaris, CLADOSPORIUM, Curvularia, and EXOPHIALA. These fungi have pigmented HYPHAE due to MELANIN in the cell wall. The initial subcutaneous cyst from the infection can become systemic and spread rapidly to renal, pulmonary and cerebral systems (see CEREBRAL PHAEOHYPHOMYCOSIS) in an IMMUNOCOMPROMISED HOST.
About the B43 Code Range
ICD-10 code B43 covers chromomycosis and pheomycotic abscesses, which are fungal infections affecting various tissues including skin, subcutaneous tissue, and the brain. These codes are specifically used to identify and classify different forms and sites of these rare fungal diseases.
The codes range from B43.0, which specifies cutaneous chromomycosis caused by fungi like Cladosporium carrionii or Fonsecaea pedrosoi—also called chromoblastomycosis—to B43.1 for a pheomycotic brain abscess, representing fungal brain infections linked to phaeohyphomycosis. Subcutaneous infections like cysts and abscesses fall under B43.2. Other less common or unspecified forms are captured with B43.8 and B43.9. These codes help medical coders and healthcare providers accurately report conditions such as phaeohyphomycosis or chromoblastomycosis when determining diagnosis and treatment plans. If searching for the ICD-10 code for infections like cutaneous chromoblastomycosis or pheomycotic brain abscess, these B43 codes provide precise categorization for clinical and billing purposes.
Questions About This Page
How many billable codes are in the B43 range?
Of the 6 codes in this range, 5 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the B43 range classify?
The range classifies chromomycosis and pheomycotic abscess. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
