ICD-10 Code B48 – Other mycoses, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B48 – Other mycoses, not elsewhere classified
What it is
B48 groups fungal infections that do not fit a more specific ICD-10 category. Use it when the record documents an unusual or unspecified mycosis and a more exact code is not available.
Clinical signs
Clinical features vary; refer to documentation. Findings may include localized or systemic fungal infection, with signs depending on the organism and site involved.
When to use this code
Use B48 when the provider clearly identifies a fungal infection but does not name a more specific diagnosis. It may also apply when the chart describes an atypical mycosis or one not indexed elsewhere. Check documentation before assigning this code.
Do not use for
Do not use B48 if the record supports a more specific mycosis code, such as a named fungal disease. Do not use it for colonization or exposure without confirmed infection.
Coding tip
Look for the exact organism, site, and provider wording first; if the documentation is vague, code only what is supported.