2027 ICD-10-CM Diagnosis Code B42.1Lymphocutaneous sporotrichosis

ICD-10-CM Codes›A00–B99›B35-B49›B42

ICD-10-CM B42.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B42.1 is a billable ICD-10-CM diagnosis code for lymphocutaneous sporotrichosis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. Coders also document this condition as cutaneous sporotrichosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections and Other specified and unspecified skin disorders.

Code Identity

ICD-10-CM Code
B42.1
Billable Status
Yes — Valid for Submission
Code Describes
Lymphocutaneous sporotrichosis
Short Description
Lymphocutaneous sporotrichosis
Same as the full description in the CMS dataset.
Parent Code
B42
Sporotrichosis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB42Sporotrichosis
This CodeB42.1Lymphocutaneous sporotrichosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cutaneous sporotrichosis
  • Lymphocutaneous sporotrichosis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B42.1: 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

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 No · outpatient No
CCSR SKN007
Other specified and unspecified skin disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Sporotrichosis

    the commonest and least serious of the deep mycoses, characterized by nodular lesions of the cutaneous and subcutaneous tissues. it is caused by inhalation of contaminated dust or by infection of a wound with sporothrix.

Patient EducationClinical

Fungal Infections

If you have ever had athlete's foot or a yeast infection, you can blame a fungus. A fungus is a primitive organism. Mushrooms, mold and mildew are examples. Fungi live in air, in soil, on plants and in water. Some live in the human body. Only about half of all types of fungi are harmful.

Read the full article at MedlinePlus

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

Convert B42.1 to ICD-9-CMHistory

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

ICD-9-CM
117.1 Sporotrichosis
Approximate The match is approximate rather than exact.

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 B42.1Overview

What is the ICD-10 code for lymphocutaneous sporotrichosis?

The ICD-10-CM code for lymphocutaneous sporotrichosis is B42.1 (sometimes written as B421). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is B42.1 (Sporotrichosis) a billable code?

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

What MS-DRG does B42.1 group to?

When lymphocutaneous sporotrichosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B42.1?

Under the General Equivalence Mappings, lymphocutaneous sporotrichosis converts to ICD-9-CM 117.1 (sporotrichosis). The mapping is approximate, so confirm the match fits the documentation.