2026 ICD-10-CM Diagnosis Code B42.81Cerebral sporotrichosis

ICD-10-CM Codes›A00–B99›B35-B49›B42

ICD-10-CM B42.81
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B42.81 is a billable ICD-10-CM diagnosis code for cerebral sporotrichosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. Coders also document this condition as extracutaneous sporotrichosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections and Meningitis.

Code Identity

ICD-10-CM Code
B42.81
Billable Status
Yes — Valid for Submission
Code Describes
Cerebral sporotrichosis
Short Description
Cerebral sporotrichosis
Same as the full description in the CMS dataset.
Parent Code
B42.8
Other forms of sporotrichosis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB42Sporotrichosis
This CodeB42.81Cerebral sporotrichosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Extracutaneous sporotrichosis
  • Fungal meningitis
  • Meningitis caused by Sporothrix schenkii

Tabular List NotesGuidance

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

Inclusion Terms

  • Meningitis due to sporotrichosis

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.

    • Meningitis(basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
      • sporotrichosis

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF004
Fungal infections
Default principal diagnosis: inpatient No · outpatient No
CCSR NVS001
Meningitis
Default principal diagnosis: inpatient Yes · outpatient Yes

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 B42.81 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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B42.81Overview

Is B42.81 (Other forms of sporotrichosis) a billable code?

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

What MS-DRG does B42.81 group to?

When cerebral sporotrichosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B42.81?

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

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.