2026 ICD-10-CM Diagnosis Code B35.6Tinea cruris

ICD-10-CM Codes›A00–B99›B35-B49›B35

ICD-10-CM B35.6
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B35.6 is a billable ICD-10-CM diagnosis code for tinea cruris. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. Coders also document this condition as tinea caused by Epidermophyton floccosum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B35.6
Billable Status
Yes — Valid for Submission
Code Describes
Tinea cruris
Short Description
Tinea cruris
Same as the full description in the CMS dataset.
Parent Code
B35
Dermatophytosis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB35Dermatophytosis
This CodeB35.6Tinea cruris

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Tinea caused by Epidermophyton floccosum
  • Tinea caused by Trichophyton rubrum
  • Tinea cruris
  • Tinea cruris caused by Epidermophyton floccosum
  • Tinea cruris caused by Trichophyton gallinae
  • Tinea cruris caused by Trichophyton rubrum

Tabular List NotesGuidance

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

Inclusion Terms

  • Dhobi itch
  • Groin ringworm
  • Jock itch

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Baerensprung's disease(eczema marginatum)
    • Dermatophytosis(epidermophyton) (infection) (Microsporum) (tinea) (Trichophyton)
      • groin
    • Dermatophytosis(epidermophyton) (infection) (Microsporum) (tinea) (Trichophyton)
      • perianal (area)
    • Dhobi itch
    • Eczema(acute) (chronic) (erythematous) (fissum) (rubrum) (squamous)
      • marginatum (hebrae)
    • Infection, infected, infective(opportunistic)
      • fungus NOS
        • groin
    • Infection, infected, infective(opportunistic)
      • fungus NOS
        • perianal (area)
    • Itch, itching
      • dhobi
    • Itch, itching
      • jock
    • Ringworm
      • groin
    • Ringworm
      • perianal (area)
    • Tinea(intersecta) (tarsi)
      • cruris

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF004
Fungal infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Tinea Cruris

    fungal infection of the groin. the main causative fungus is trichophyton.

  • Trichophyton

    a mitosporic fungal genus and an anamorphic form of arthroderma. various species attack the skin, nails, and hair.

Patient EducationClinical

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.

Read the full article at MedlinePlus

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

Convert B35.6 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
110.3 Dermatophytosis of groin
Exact Match The mapping is direct, with no qualifiers.

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 B35.6Overview

Is B35.6 (Dermatophytosis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report tinea cruris on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B35.6 group to?

When tinea cruris is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B35.6?

Under the General Equivalence Mappings, tinea cruris converts to ICD-9-CM 110.3 (dermatophytosis of groin). The mapping is a direct match.

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.