ICD-10-CM
ICD-10 code for Toenail fungus: B35.1
The closest CDC title for "Toenail fungus" is B35.1, Tinea unguium. B35.1 is a billable code.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under B35, then other CDC titles that name tinea unguium
A header groups codes and is not billed. A billable code is one you can report.
Related conditions
Related pages
- B35.1 code detailsNotes, nearby codes, CMS-HCC group
- Category B35Every code under it
- Chapter 1Certain infectious and parasitic diseases
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Toenail fungus?
The closest CDC title for "Toenail fungus" is B35.1, Tinea unguium. B35.1 is a billable code.
Is B35.1 billable?
Yes. B35.1 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What chapter is B35.1 in?
Chapter 1. Certain infectious and parasitic diseases.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.