ICD-10 Code B42.9 – Sporotrichosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B42.9 – Sporotrichosis, unspecified
What it is
B42.9 identifies sporotrichosis when the record does not specify the body site or clinical form. It is a fungal infection caused by Sporothrix species and is coded when documentation remains nonspecific.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include a skin lesion after traumatic inoculation, nodules, or lymphatic spread along an extremity.
When to use this code
Use B42.9 when the provider documents sporotrichosis but does not identify cutaneous, lymphocutaneous, pulmonary, or other specified involvement. It also fits when the note confirms the infection yet gives insufficient detail for a more specific code. Check documentation if the site or form is later clarified.
Do not use for
Do not use B42.9 when the record specifies another form of sporotrichosis or a different fungal infection. Avoid this code if the documentation is incomplete and you can query for a more precise diagnosis.
Coding tip
Query for the exact site or clinical form before defaulting to unspecified.