2027 ICD-10-CM Diagnosis Code B35Dermatophytosis

ICD-10-CM Codes›A00–B99›B35-B49›B35

ICD-10-CM B35
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Dermatophytosis
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B35: its own notes plus those printed at block B35-B49 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

On B35 itself
  • favus
  • infections due to species of Epidermophyton, Micro-sporum and Trichophyton
  • tinea, any type except those in B36.-
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block B35-B49 Mycoses applies to 104 codes
  • hypersensitivity pneumonitis due to organic dust (J67.-)
  • mycosis fungoides (C84.0-)
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical InformationClinical

  • Tinea

    fungal infection of keratinized tissues such as hair, skin and nails. the main causative fungi include microsporum; trichophyton; and epidermophyton.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B35Overview

What is the ICD-10 code for dermatophytosis?

B35 is the ICD-10-CM category for dermatophytosis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.