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ICD-10-CM 2027 diagnosis code

B35.3Tinea pedis

✓ Billable / specific

B35.3 is a valid, billable ICD-10-CM code for tinea pedis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Foot tinea, ICD-10 code for Pedis tinea, ICD-10 code for Foot ringworm, ICD-10 code for Foot athlete's.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About B35.3

B35.3 is the ICD-10-CM diagnosis code for tinea pedis. It belongs to category B35 (dermatophytosis), block B35-B49 (mycoses) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within B35 (dermatophytosis), B35.3 is specifically for tinea pedis. Related codes cover tinea barbae and tinea capitis (B35.0), tinea unguium (B35.1), tinea manuum (B35.2), tinea corporis (B35.4), tinea imbricata (B35.5), tinea cruris (B35.6), other dermatophytoses (B35.8) and unspecified (B35.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 110.4 (dermatophytosis of foot).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Athlete's foot
  • Dermatophytosis of foot
  • Foot ringworm

Notes that apply from higher levels

Instructions written at a parent level also apply to B35.3.

› From B35 Dermatophytosis
Includes
  • favus
  • infections due to species of Epidermophyton, Micro-sporum and Trichophyton
  • tinea, any type except those in B36.-

Broader instructions also apply from B35-B49 Mycoses and Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

9 entries

Terms in the official ICD-10-CM index that lead to B35.3.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast

ICD-9-CM equivalent

Converter →
  • 110.4Dermatophytosis of footexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about B35.3

Is B35.3 billable?

Yes. B35.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can B35.3 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict B35.3 as a principal diagnosis.

Is B35.3 a CC or MCC?

No. B35.3 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does B35.3 group to?

B35.3 is used in the MS-DRG v44.0 logic for MS-DRG 606 (Minor Skin Disorders with MCC) and MS-DRG 607 (Minor Skin Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for B35.3?

The CMS General Equivalence Mappings map B35.3 to ICD-9-CM 110.4.