2024 ICD-10-CM Diagnosis Code B35.1

Tinea unguium

ICD-10-CM Code:
B35.1
ICD-10 Code for:
Tinea unguium
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Certain infectious and parasitic diseases
    (A00–B99)

B35.1 is a billable diagnosis code used to specify a medical diagnosis of tinea unguium. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

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

  • Distal and lateral subungual onychomycosis
  • Endonyx onychomycosis
  • Fusarium infection
  • Infection caused by Scytalidium
  • Infection of skin caused by Neoscytalidium dimidiatum
  • Infection of toenail
  • Nail bed infection
  • Nail bed infection
  • Neoscytalidium dermatomycosis
  • Onycholysis
  • Onycholysis due to fungal infection of nail
  • Onychomycosis
  • Onychomycosis caused by Acremonium
  • Onychomycosis caused by Neocucurbitaria unguis-hominis
  • Onychomycosis caused by Neoscytalidium dimidiatum
  • Onychomycosis due to Botryodiplodia theobromae
  • Onychomycosis due to Curvularia lunata
  • Onychomycosis due to dermatophyte
  • Onychomycosis due to Epidermophyton floccosum
  • Onychomycosis due to Fusarium
  • Onychomycosis due to mold infection
  • Onychomycosis due to Onychocola canadensis
  • Onychomycosis due to opportunistic infection
  • Onychomycosis due to Pseudeurotium ovale
  • Onychomycosis due to Scopulariopsis brevicaulis
  • Onychomycosis due to Scytalidium hyalinum
  • Onychomycosis due to Trichophyton interdigitale
  • Onychomycosis due to Trichophyton mentagrophytes
  • Onychomycosis due to Trichophyton rubrum
  • Onychomycosis due to Trichophyton schoenleinii
  • Onychomycosis due to Trichophyton soudanense
  • Onychomycosis due to Trichophyton tonsurans
  • Onychomycosis due to Trichophyton violaceum
  • Onychomycosis of nail of digit
  • Onychomycosis of toenails
  • Proximal subungual onychomycosis
  • Scytalidium hyalinum infection of skin
  • Superficial white onychomycosis
  • Tinea due to Epidermophyton floccosum
  • Tinea due to Trichophyton mentagrophytes variant interdigitale
  • Tinea due to Trichophyton rubrum
  • Tinea due to Trichophyton soudanense
  • Tinea due to Trichophyton tonsurans
  • Tinea due to Trichophyton violaceum
  • Total dystrophic onychomycosis

Clinical Classification

Clinical Information

  • Onychomycosis

    a fungal infection of the nail, usually caused by dermatophytes; yeasts; or nondermatophyte molds.
  • Onycholysis

    separation of nail plate from the underlying nail bed. it can be a sign of skin disease, infection (such as onychomycosis) or tissue injury.
  • Onycholysis

    a nail condition characterized by spontaneous separation of a fingernail or toenail from its nail bed.

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.
  • Dermatophytic onychia
  • Dermatophytosis of nail
  • Onychomycosis
  • Ringworm of nails

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 B35.1 to ICD-9-CM

  • ICD-9-CM Code: 110.1 - Dermatophytosis of nail

Patient Education


Tinea Infections

Tinea is the name of a group of diseases caused by a fungus. Types of tinea include ringworm, athlete's foot and jock itch. These infections are usually not serious, but they can be uncomfortable. You can get them by touching an infected person, from damp surfaces such as shower floors, or even from a pet.

Symptoms depend on the affected area of the body:

  • Ringworm is a red skin rash that forms a ring around normal-looking skin. A worm doesn't cause it.
  • Scalp ringworm causes itchy, red patches on your head. It can leave bald spots. It usually affects children.
  • Athlete's foot causes itching, burning and cracked skin between your toes.
  • Jock itch causes an itchy, burning rash in your groin area.

Over-the-counter creams and powders will get rid of many tinea infections, particularly athlete's foot and jock itch. Other cases require prescription medicine.


[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.

Footnotes

[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.