Other superficial mycoses (B36) ICD-10-CM
The B36 code range covers other superficial mycoses with 7 ICD-10-CM diagnosis codes. 6 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 B36 Range 7 codes · 6 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B36 range.
Aspergillus
A genus of mitosporic fungi containing about 100 species and eleven different teleomorphs in the family Trichocomaceae.
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.
Mucormycosis
Infection in humans and animals caused by any fungus in the order MUCORALES (e.g., RHIZOPUS; MUCOR; CUNNINGHAMELLA; APOPHYSOMYCES; ABSIDIA; SAKSENAEA and RHIZOMUCOR) There are many clinical types associated with infection including central nervous system, lung, gastrointestinal tract, skin, orbit and paranasal sinuses. In humans, it usually occurs as an OPPORTUNISTIC INFECTION.
Otomycosis
Fungus infection of the external ear, usually by ASPERGILLUS species
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.
Tinea Cruris
Fungal infection of the groin. The main causative fungus is TRICHOPHYTON.
Trichophyton
A mitosporic fungal genus and an anamorphic form of Arthroderma. Various species attack the skin, nails, and hair.
Trichosporonosis
Fungal infections caused by TRICHOSPORON that may become systemic especially in an IMMUNOCOMPROMISED HOST. Clinical manifestations range from superficial cutaneous infections to systemic lesions in multiple organs.
Zygomycosis
Infection in humans and animals caused by fungi in the class Zygomycetes. It includes MUCORMYCOSIS and entomophthoramycosis. The latter is a tropical infection of subcutaneous tissue or paranasal sinuses caused by fungi in the order Entomophthorales. Phycomycosis, closely related to zygomycosis, describes infection with members of Phycomycetes, an obsolete classification.
About the B36 Code Range
This section covers the ICD-10 codes used to classify various types of superficial fungal infections of the skin and hair. These codes help identify specific conditions caused by fungi affecting the outer layers of the body, including less common infections beyond typical dermatophyte diseases.
The primary code B36 represents other superficial mycoses. Subcodes specify distinct fungal infections like B36.0 for Pityriasis versicolor, also known as Malassezia infection of skin, which causes patchy discoloration. B36.1 identifies Tinea nigra, an infection often caused by Cladosporium werneckii, appearing as dark patches on palms or soles. B36.2 and B36.3 refer to White piedra and Black piedra respectively, fungal infections of hair shafts caused by different organisms such as Trichosporon species and Piedraia. The code B36.8 covers other specified superficial mycoses, including fungal infections like neonatal cephalic pustulosis and cutaneous aspergillosis caused by various molds. Finally, B36.9 is used when the superficial fungal infection is unspecified, including chronic fungal otitis externa or fungal dermatitis. These ICD-10 codes are essential for precisely coding fungal skin infections to improve diagnosis and treatment documentation.
Questions About This Page
How many billable codes are in the B36 range?
Of the 7 codes in this range, 6 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 B36 range classify?
The range classifies other superficial mycoses. 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.
