2026 ICD-10-CM Diagnosis Code B35Dermatophytosis

ICD-10-CM Codes›A00–B99›B35-B49›B35

ICD-10-CM B35
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B35 is a non-billable ICD-10-CM category code for dermatophytosis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B35.0, B35.1, B35.2, and B35.3.

Code Identity

ICD-10-CM Code
B35
Billable Status
No — Non-Billable Category
Code Describes
Dermatophytosis
Chapter
B35-B49
Mycoses

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB35Dermatophytosis
This CodeB35Dermatophytosis

Specific Coding for DermatophytosisOverview

Non-specific codes like B35 require more characters. Use one of these billable codes instead:

  • Use B35.0 for Tinea barbae and tinea capitis

  • Use B35.1 for Tinea unguium

  • Use B35.2 for Tinea manuum

  • Use B35.3 for Tinea pedis

  • Use B35.4 for Tinea corporis

  • Use B35.5 for Tinea imbricata

  • Use B35.6 for Tinea cruris

  • Use B35.8 for Other dermatophytoses

  • Use B35.9 for Dermatophytosis, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

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

Clinical InformationClinical

  • Deep Seated Dermatophytosis

    a deep folliculitis due to a cutaneous dermatophyte infection, usually on the legs. it is most commonly caused by trichophyton rubrum and is characterized by the formation of spongy granulomas which persist for three to four months and leaves deep scars.

  • Dermatophytosis

    a common fungal infection of the stratum corneum of the skin, hair, or nails by a dermatophyte. it is characterized by itching, inflammation, redness of the skin, small papular vesicles, central clearing, fissures, scaling, and/or hair loss in the affected area.

  • Dermatophytosis of Groin and Perianal Area

    dermatophytosis involving the stratum corneum of the skin of the groin and perianal area.

  • Dermatophytosis of Scalp and Beard

    dermatophytosis involving the stratum corneum of the skin of the scalp and beard area.

Patient EducationClinical

Fungal Infections

If you have ever had athlete's foot or a yeast infection, you can blame a fungus. A fungus is a primitive organism. Mushrooms, mold and mildew are examples. Fungi live in air, in soil, on plants and in water. Some live in the human body. Only about half of all types of fungi are harmful.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B35Overview

Is B35 (Dermatophytosis) a billable code?

No. This is a category header that groups the codes for dermatophytosis, and headers cannot be submitted on claims. Claims for dermatophytosis need a more specific code from this category, such as B35.0, B35.1, and B35.2.