2026 ICD-10-CM Diagnosis Code B40.89Other forms of blastomycosis

ICD-10-CM Codes›A00–B99›B35-B49›B40

ICD-10-CM B40.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B40.89 is a billable ICD-10-CM diagnosis code for other forms of blastomycosis. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B40.89
Billable Status
Yes — Valid for Submission
Code Describes
Other forms of blastomycosis
Short Description
Other forms of blastomycosis
Same as the full description in the CMS dataset.
Parent Code
B40.8
Other forms of blastomycosis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB40Blastomycosis
This CodeB40.89Other forms of blastomycosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Blastomyces infection of central nervous system
  • Blastomycosis liver
  • Blastomycotic enteritis of intestine
  • Blastomycotic enteritis of small intestine
  • Dacryoadenitis caused by Blastomyces
  • Endocarditis - blastomycosis
  • Fungal infection of liver
  • Infection by Blastomyces dermatitidis
  • Infection of lacrimal gland caused by fungus
  • Mycotic endocarditis
  • Ocular blastomycosis
  • Urogenital blastomycosis

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.

    • Blastomycosis, blastomycotic
      • specified NEC

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

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 B40.89 to ICD-9-CMHistory

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

ICD-9-CM
116.0 Blastomycosis
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 B40.89Overview

Is B40.89 (Other forms of blastomycosis) a billable code?

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

What MS-DRG does B40.89 group to?

When other forms of blastomycosis 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 B40.89?

Under the General Equivalence Mappings, other forms of blastomycosis converts to ICD-9-CM 116.0 (blastomycosis). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.