Mycoses (B35-B49)
ICD-10 codes B35-B49 cover a broad range of fungal infections known as mycoses, including superficial, systemic, and unspecified fungal diseases. This chapter includes detailed codes for common and rare fungal infections affecting the skin, nails, respiratory system, central nervous system, and other organs.
The range begins with B35, addressing various dermatophytoses such as tinea capitis (scalp ringworm), tinea corporis (body ringworm), tinea pedis (athlete’s foot), and tinea cruris (jock itch). Synonyms like "Tinea barbae" or "Onychomycosis" guide coders to precise diagnoses for hair, nail, and skin fungal infections. Superficial mycoses in B36 include conditions like pityriasis versicolor and tinea nigra, while B37 focuses on candidiasis, encompassing mucosal infections such as candidal stomatitis, vaginal candidiasis, and systemic candidiasis including candidal sepsis and meningitis. Codes B38 to B49 represent deep and systemic mycoses like coccidioidomycosis, histoplasmosis, blastomycosis, and aspergillosis, among others. These codes also cover rarer fungal diseases such as cryptococcosis, mucormycosis, and sporotrichosis with categories specifying pulmonary, cutaneous, disseminated, and meningitis forms, aiding in accurate documentation for diverse fungal infections.
Medical coders can rely on this chapter to differentiate fungal conditions by site and severity, using synonyms listed (for instance, "Pityriasis versicolor" under B36.0 or "Blastomycosis, unspecified" under B40.9) to clarify ambiguous terms. Healthcare providers find this range valuable for tracking infections from common athlete’s foot and candidiasis to life-threatening systemic mycoses. Accurate coding ensures appropriate diagnosis classification for treatment planning and reporting.
- Dermatophytosis (B35)
- Other superficial mycoses (B36)
- Candidiasis (B37)
- Coccidioidomycosis (B38)
- Histoplasmosis (B39)
- Blastomycosis (B40)
- Paracoccidioidomycosis (B41)
- Sporotrichosis (B42)
- Chromomycosis and pheomycotic abscess (B43)
- Aspergillosis (B44)
- Cryptococcosis (B45)
- Zygomycosis (B46)
- Mycetoma (B47)
- Other mycoses, not elsewhere classified (B48)
- Unspecified mycosis (B49)
Certain infectious and parasitic diseases (A00–B99)
Mycoses (B35-B49)
B37 Candidiasis
- B37.0 Candidal stomatitis
- B37.1 Pulmonary candidiasis
- B37.2 Candidiasis of skin and nail
B37.3 Candidiasis of vulva and vagina
- B37.31 Acute candidiasis of vulva and vagina
- B37.32 Chronic candidiasis of vulva and vagina
B37.4 Candidiasis of other urogenital sites
- B37.41 Candidal cystitis and urethritis
- B37.42 Candidal balanitis
- B37.49 Other urogenital candidiasis
- B37.5 Candidal meningitis
- B37.6 Candidal endocarditis
- B37.7 Candidal sepsis
B37.8 Candidiasis of other sites
- B37.81 Candidal esophagitis
- B37.82 Candidal enteritis
- B37.83 Candidal cheilitis
- B37.84 Candidal otitis externa
- B37.89 Other sites of candidiasis
- B37.9 Candidiasis, unspecified
Candidiasis (B37)
B38 Coccidioidomycosis
- B38.0 Acute pulmonary coccidioidomycosis
- B38.1 Chronic pulmonary coccidioidomycosis
- B38.2 Pulmonary coccidioidomycosis, unspecified
- B38.3 Cutaneous coccidioidomycosis
- B38.4 Coccidioidomycosis meningitis
- B38.7 Disseminated coccidioidomycosis
B38.8 Other forms of coccidioidomycosis
- B38.81 Prostatic coccidioidomycosis
- B38.89 Other forms of coccidioidomycosis
- B38.9 Coccidioidomycosis, unspecified
Coccidioidomycosis (B38)
B39 Histoplasmosis
- B39.0 Acute pulmonary histoplasmosis capsulati
- B39.1 Chronic pulmonary histoplasmosis capsulati
- B39.2 Pulmonary histoplasmosis capsulati, unspecified
- B39.3 Disseminated histoplasmosis capsulati
- B39.4 Histoplasmosis capsulati, unspecified
- B39.5 Histoplasmosis duboisii
- B39.9 Histoplasmosis, unspecified
Histoplasmosis (B39)
B40 Blastomycosis
- B40.0 Acute pulmonary blastomycosis
- B40.1 Chronic pulmonary blastomycosis
- B40.2 Pulmonary blastomycosis, unspecified
- B40.3 Cutaneous blastomycosis
- B40.7 Disseminated blastomycosis
B40.8 Other forms of blastomycosis
- B40.81 Blastomycotic meningoencephalitis
- B40.89 Other forms of blastomycosis
- B40.9 Blastomycosis, unspecified
Blastomycosis (B40)
B42 Sporotrichosis
- B42.0 Pulmonary sporotrichosis
- B42.1 Lymphocutaneous sporotrichosis
- B42.7 Disseminated sporotrichosis
B42.8 Other forms of sporotrichosis
- B42.81 Cerebral sporotrichosis
- B42.82 Sporotrichosis arthritis
- B42.89 Other forms of sporotrichosis
- B42.9 Sporotrichosis, unspecified
Sporotrichosis (B42)
B44 Aspergillosis
- B44.0 Invasive pulmonary aspergillosis
- B44.1 Other pulmonary aspergillosis
- B44.2 Tonsillar aspergillosis
- B44.7 Disseminated aspergillosis
B44.8 Other forms of aspergillosis
- B44.81 Allergic bronchopulmonary aspergillosis
- B44.89 Other forms of aspergillosis
- B44.9 Aspergillosis, unspecified
Aspergillosis (B44)
B47 Mycetoma
- B47.0 Eumycetoma
- B47.1 Actinomycetoma
- B47.9 Mycetoma, unspecified
Mycetoma (B47)
- B49 Unspecified mycosis
Unspecified mycosis (B49)
Instructional Notations
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
