2024 ICD-10-CM Diagnosis Code B35.9

Dermatophytosis, unspecified

ICD-10-CM Code:
ICD-10 Code for:
Dermatophytosis, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Certain infectious and parasitic diseases

B35.9 is a billable diagnosis code used to specify a medical diagnosis of dermatophytosis, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like B35.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

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 caused by Microsporum praecox
  • Dermatophytosis co-occurrent with human immunodeficiency virus infection
  • Disseminated dermatophytosis
  • Disseminated dermatophytosis due to immunodeficiency
  • Favus due to Trichophyton gallinae
  • Favus due to Trichophyton schoenleinii
  • Id reaction
  • Steroid-modified tinea infection
  • Steroid-modified tinea infection of lower limb
  • 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 Classification

Clinical Information

  • 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.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.

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 References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert B35.9 to ICD-9-CM

  • ICD-9-CM Code: 110.9 - Dermatophytosis site NOS

Patient Education

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.

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.

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.


[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.