2026 ICD-10-CM Diagnosis Code B35.3Tinea pedis

ICD-10-CM Codes›A00–B99›B35-B49›B35

ICD-10-CM B35.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B35.3 is a billable ICD-10-CM diagnosis code for tinea pedis. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B35.3
Billable Status
Yes — Valid for Submission
Code Describes
Tinea pedis
Short Description
Tinea pedis
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 CodeB35.3Tinea pedis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Steroid-modified tinea infection
  • Steroid-modified tinea infection of foot
  • Steroid-modified tinea infection of lower limb
  • Tinea caused by Epidermophyton floccosum
  • Tinea caused by Trichophyton mentagrophytes variant interdigitale
  • Tinea caused by Trichophyton rubrum
  • Tinea caused by Trichophyton violaceum
  • Tinea pedis
  • Tinea pedis caused by Epidermophyton
  • Tinea pedis caused by Epidermophyton floccosum
  • Tinea pedis caused by Trichophyton
  • Tinea pedis caused by Trichophyton mentagrophytes variant interdigitale
  • Tinea pedis caused by Trichophyton rubrum
  • Tinea pedis caused by Trichophyton violaceum

Tabular List NotesGuidance

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

Inclusion Terms

  • Athlete's foot
  • Dermatophytosis of foot
  • Foot ringworm

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.

    • Athlete's
      • foot
    • Dermatophytosis(epidermophyton) (infection) (Microsporum) (tinea) (Trichophyton)
      • foot
    • Infection, infected, infective(opportunistic)
      • foot (skin)
        • dermatophytic fungus
    • Infection, infected, infective(opportunistic)
      • fungus NOS
        • foot
    • Infection, infected, infective(opportunistic)
      • fungus NOS
        • skin
          • foot
    • Itch, itching
      • Malabar
        • foot
    • Ringworm
      • foot
    • Tinea(intersecta) (tarsi)
      • foot
    • Tinea(intersecta) (tarsi)
      • pedis

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 Pedis

    dermatological pruritic lesion in the feet, caused by trichophyton rubrum, t. mentagrophytes, or epidermophyton floccosum.

Patient EducationClinical

Athlete's Foot

Athlete's foot is a common infection caused by a fungus. It most often affects the space between the toes. Symptoms include itching, burning, and cracked, scaly skin between your toes.

Read the full article at MedlinePlus

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

Convert B35.3 to ICD-9-CMHistory

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

ICD-9-CM
110.4 Dermatophytosis of foot
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 B35.3Overview

Is B35.3 (Dermatophytosis) a billable code?

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

What MS-DRG does B35.3 group to?

When tinea pedis 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 B35.3?

Under the General Equivalence Mappings, tinea pedis converts to ICD-9-CM 110.4 (dermatophytosis of foot). 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.