2026 ICD-10-CM Diagnosis Code B38.9Coccidioidomycosis, unspecified

ICD-10-CM Codes›A00–B99›B35-B49›B38

ICD-10-CM B38.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B38.9 is a billable ICD-10-CM diagnosis code for coccidioidomycosis, unspecified. 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, 974 through 976. Coders also document this condition as acute coccidioidomycosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B38.9
Billable Status
Yes — Valid for Submission
Code Describes
Coccidioidomycosis, unspecified
Short Description
Coccidioidomycosis, unspecified
Same as the full description in the CMS dataset.
Parent Code
B38
Coccidioidomycosis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB38Coccidioidomycosis
This CodeB38.9Coccidioidomycosis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute coccidioidomycosis
  • Coccidioides immitis or Coccidioides posadasii
  • Coccidioidomycosis
  • Coccidioidomycosis with AIDS
  • Erythema nodosum due to coccidioidomycosis
  • Infection by Coccidioides immitis

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.

    • California
      • disease
    • Coccidioidomycosis
    • Disease, diseased
      • Posadas-Wernicke
    • Disease, diseased
      • Wernicke-Posadas
    • Posadas-Wernicke disease
    • Wernicke-Posadas disease

Clinical ClassificationClinical

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

CCSR INF004
Fungal infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Coccidioidal Meningitis

    meningitis caused by a fungus of the genus coccidioides, endemic to the southwestern united states, south-central washington state, and parts of mexico and central and south america.

  • Coccidioidomycosis

    infection with a fungus of the genus coccidioides, endemic to the southwestern united states. it is sometimes called valley fever but should not be confused with rift valley fever. infection is caused by inhalation of airborne, fungal particles known as arthroconidia, a form of fungal spores. a primary form is an acute, benign, self-limited respiratory infection. a secondary form is a virulent, severe, chronic, progressive granulomatous disease with systemic involvement. it can be detected by use of coccidioidin.

Patient EducationClinical

Valley Fever

Valley Fever is a disease caused by a fungus (or mold) called Coccidioides. The fungi live in the soil of dry areas like the southwestern U.S. You get it from inhaling the spores of the fungus. The infection cannot spread from person to person.

Read the full article at MedlinePlus

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

Convert B38.9 to ICD-9-CMHistory

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

ICD-9-CM
114.9 Coccidioidomycosis NOS
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B38.9Overview

Is B38.9 (Coccidioidomycosis) a billable code?

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

What MS-DRG does B38.9 group to?

When coccidioidomycosis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, 974, 975, 976, with relative weights from 0.7297 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B38.9?

Under the General Equivalence Mappings, coccidioidomycosis, unspecified converts to ICD-9-CM 114.9 (coccidioidomycosis NOS). The mapping is a direct match.

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.