ICD-10 Code B46.5 – Mucormycosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B46.5 – Mucormycosis, unspecified
What it is
B46.5 identifies mucormycosis when the specific site or form is not documented. It is used for a serious fungal infection caused by Mucorales species.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include rapidly progressive tissue infection, necrosis, sinus or pulmonary involvement, or invasive disease in an immunocompromised patient.
When to use this code
Use B46.5 when the record states mucormycosis but does not specify rhino-cerebral, pulmonary, gastrointestinal, cutaneous, or disseminated involvement. It also fits when the clinician documents mucormycosis without further detail. Check documentation if a more specific site is later identified.
Do not use for
Do not use this code for other fungal infections, such as candidiasis or aspergillosis. If the documentation names a specific mucormycosis site or type, code that more precise diagnosis instead.
Coding tip
Query for the anatomic site and extent of infection before defaulting to the unspecified code.