2027 ICD-10-CM Diagnosis Code B36.1Tinea nigra

ICD-10-CM Codes›A00–B99›B35-B49›B36

ICD-10-CM B36.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B36.1 is a billable ICD-10-CM diagnosis code for tinea nigra. 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. Coders also document this condition as infection by Cladosporium werneckii. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B36.1
Billable Status
Yes — Valid for Submission
Code Describes
Tinea nigra
Short Description
Tinea nigra
Same as the full description in the CMS dataset.
Parent Code
B36
Other superficial mycoses

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB36Other superficial mycoses
This CodeB36.1Tinea nigra

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Infection by Cladosporium werneckii
  • Tinea nigra
  • Tinea nigra caused by Phaeoannellomyces werneckii
  • Tinea nigra caused by Stenella araguata

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B36.1: its own notes plus those printed at 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 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.

  • Keratomycosis nigricans palmaris
  • Microsporosis nigra
  • Pityriasis nigra

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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name B36.1, its category, or a range that includes it.

Includes 1

These notes mention B36.1.

  • B35 Dermatophytosis
    tinea, any type except those in B36.- names B36.-, which includes this code

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

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 B36.1 to ICD-9-CMHistory

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

ICD-9-CM
111.1 Tinea nigra
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 B36.1Overview

What is the ICD-10 code for tinea nigra?

The ICD-10-CM code for tinea nigra is B36.1 (sometimes written as B361). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is B36.1 (Other superficial mycoses) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report tinea nigra on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does B36.1 group to?

When tinea nigra 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 B36.1?

Under the General Equivalence Mappings, tinea nigra converts to ICD-9-CM 111.1 (tinea nigra). The mapping is a direct match.