2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B35.3 is a billable ICD-10-CM diagnosis code for tinea pedis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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 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 interdigitale
  • Tinea pedis caused by Trichophyton rubrum
  • Tinea pedis caused by Trichophyton violaceum

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B35.3: its own notes plus those printed at B35, block B35-B49, and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From B35 Dermatophytosis applies to 9 codes
  • favus
  • infections due to species of Epidermophyton, Micro-sporum and Trichophyton
  • tinea, any type except those in B36.-
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

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

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block B35-B49 Mycoses applies to 104 codes
  • hypersensitivity pneumonitis due to organic dust (J67.-)
  • mycosis fungoides (C84.0-)
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B35.3Overview

What is the ICD-10 code for tinea pedis?

The ICD-10-CM code for tinea pedis is B35.3 (sometimes written as B353). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does B35.3 group to?

When tinea pedis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 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.