2026 ICD-10-CM Diagnosis Code B38.0Acute pulmonary coccidioidomycosis

ICD-10-CM Codes›A00–B99›B35-B49›B38

ICD-10-CM B38.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B38.0 is a billable ICD-10-CM diagnosis code for acute pulmonary coccidioidomycosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 177 through 179, 974 through 976. Coders also document this condition as acute coccidioidomycosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections and Pneumonia (except that caused by tuberculosis).

Code Identity

ICD-10-CM Code
B38.0
Billable Status
Yes — Valid for Submission
Code Describes
Acute pulmonary coccidioidomycosis
Short Description
Acute pulmonary coccidioidomycosis
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 CodeB38.0Acute pulmonary coccidioidomycosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute coccidioidomycosis
  • Acute pneumonia caused by coccidioidomycosis
  • Acute pulmonary coccidioidomycosis
  • Infection by Coccidioides immitis
  • Pulmonary coccidioidomycosis

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.

    • Coccidioidomycosis
      • pulmonary
        • acute
    • Desert
      • rheumatism
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • desert
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • San Joaquin (Valley)
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • valley
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • in (due to)
        • coccidioidomycosis
          • acute
    • San Joaquin(Valley) fever
    • Valley fever

Clinical ClassificationClinical

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

CCSR INF004
Fungal infections
Default principal diagnosis: inpatient No · outpatient No
CCSR RSP002
Pneumonia (except that caused by tuberculosis)
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 B38.0 to ICD-9-CMHistory

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

ICD-9-CM
114.0 Primary coccidioidomycos
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 B38.0Overview

Is B38.0 (Coccidioidomycosis) a billable code?

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

What MS-DRG does B38.0 group to?

When acute pulmonary coccidioidomycosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 177, 178, 179, 974, 975, 976, with relative weights from 0.7550 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B38.0?

Under the General Equivalence Mappings, acute pulmonary coccidioidomycosis converts to ICD-9-CM 114.0 (primary coccidioidomycos). 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.