---
title: "ICD-10-CM B35.9: Dermatophytosis, unspecified | BillingBrief"
description: "ICD-10-CM code B35.9: Dermatophytosis, unspecified. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/b35.9/"
language: "en"
---

# B35.9 Dermatophytosis, unspecified

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Dermatophytosis, unspecified

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Also covers

-   Ringworm NOS

### Includes

-   favus
-   infections due to species of Epidermophyton, Micro-sporum and Trichophyton
-   tinea, any type except those in B36.-

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   hypersensitivity pneumonitis due to organic dust (J67.-)
-   mycosis fungoides (C84.0-)

## Related codes

-   [`B35.0` Tinea barbae and tinea capitis ICD-10-CM](https://billingbrief.com/icd10/b35.0/)
-   [`B35.1` Tinea unguium ICD-10-CM](https://billingbrief.com/icd10/b35.1/)
-   [`B35.2` Tinea manuum ICD-10-CM](https://billingbrief.com/icd10/b35.2/)
-   [`B35.3` Tinea pedis ICD-10-CM](https://billingbrief.com/icd10/b35.3/)
-   [`B35.4` Tinea corporis ICD-10-CM](https://billingbrief.com/icd10/b35.4/)
-   [`B35.5` Tinea imbricata ICD-10-CM](https://billingbrief.com/icd10/b35.5/)
-   [`B35.6` Tinea cruris ICD-10-CM](https://billingbrief.com/icd10/b35.6/)
-   [`B35.8` Other dermatophytoses ICD-10-CM](https://billingbrief.com/icd10/b35.8/)

## Common questions

### Is B35.9 a billable code?

Yes. B35.9 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

B35 Dermatophytosis

Chapter

Certain infectious and parasitic diseases

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).