ICD-10-CM Code B35.9

Dermatophytosis, unspecified

Version 2021 Billable Code

Valid for Submission

B35.9 is a billable code used to specify a medical diagnosis of dermatophytosis, unspecified. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code B35.9 might also be used to specify conditions or terms like allergy-sensitivity to fungi syndrome, dermatophytosis, dermatophytosis co-occurrent with human immunodeficiency virus infection, favus due to trichophyton gallinae, favus due to trichophyton schoenleinii, id reaction, etc

Short Description:Dermatophytosis, unspecified
Long Description:Dermatophytosis, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code B35.9:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Ringworm NOS

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code B35.9 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Allergy-sensitivity to fungi syndrome
  • Dermatophytosis
  • Dermatophytosis co-occurrent with human immunodeficiency virus infection
  • Favus due to Trichophyton gallinae
  • Favus due to Trichophyton schoenleinii
  • Id reaction
  • Tinea caused by Trichophyton persicolor
  • Tinea due to Epidermophyton floccosum
  • Tinea due to Genus Trichophyton
  • Tinea due to Microsporum audouinii
  • Tinea due to Microsporum canis variant canis
  • Tinea due to Microsporum canis variant distortum
  • Tinea due to Microsporum equinum
  • Tinea due to Microsporum ferrugineum
  • Tinea due to Microsporum gypseum
  • Tinea due to Microsporum nanum
  • Tinea due to Microsporum vanbreuseghemii
  • Tinea due to Nannizzia fulva
  • Tinea due to Trichophyton concentricum
  • Tinea due to Trichophyton equinum
  • Tinea due to Trichophyton megninii
  • Tinea due to Trichophyton mentagrophytes
  • Tinea due to Trichophyton mentagrophytes variant erinacei
  • Tinea due to Trichophyton mentagrophytes variant interdigitale
  • Tinea due to Trichophyton rubrum
  • Tinea due to Trichophyton simii
  • Tinea due to Trichophyton soudanense
  • Tinea due to Trichophyton tonsurans
  • Tinea due to Trichophyton verrucosum
  • Tinea due to Trichophyton violaceum
  • Tinea due to Trichophyton yaoundei
  • Trichophytosis

Clinical Information

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

Diagnostic Related Groups

The ICD-10 code B35.9 is grouped in the following groups for version MS-DRG V38.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2020 through 09/30/2021.


Convert B35.9 to ICD-9

  • 110.9 - Dermatophytosis site NOS

Code Classification

  • Certain infectious and parasitic diseases (A00–B99)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients

Fungal Infections

Also called: Mycoses

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.

Some fungi reproduce through tiny spores in the air. You can inhale the spores or they can land on you. As a result, fungal infections often start in the lungs or on the skin. You are more likely to get a fungal infection if you have a weakened immune system or take antibiotics.

Fungi can be difficult to kill. For skin and nail infections, you can apply medicine directly to the infected area. Oral antifungal medicines are also available for serious infections.

NIH: National Institute of Allergy and Infectious Diseases

  • Blastomycosis (Medical Encyclopedia)
  • Cryptococcosis (Medical Encyclopedia)
  • Fungal nail infection (Medical Encyclopedia)
  • Mucormycosis (Medical Encyclopedia)
  • Sputum fungal smear (Medical Encyclopedia)
  • Tinea versicolor (Medical Encyclopedia)

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