2026 ICD-10-CM Diagnosis Code B37.1Pulmonary candidiasis

ICD-10-CM Codes›A00–B99›B35-B49›B37

ICD-10-CM B37.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B37.1 is a billable ICD-10-CM diagnosis code for pulmonary candidiasis. 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 candidiasis of lung. 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
B37.1
Billable Status
Yes — Valid for Submission
Code Describes
Pulmonary candidiasis
Short Description
Pulmonary candidiasis
Same as the full description in the CMS dataset.
Parent Code
B37
Candidiasis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB37Candidiasis
This CodeB37.1Pulmonary candidiasis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Candidiasis of lung
  • Candidiasis of lung with AIDS
  • Candidiasis of trachea
  • Disorder of respiratory system co-occurrent with human immunodeficiency virus infection
  • Neonatal candidiasis
  • Neonatal candidiasis of lung
  • Pneumonia with AIDS
  • Respiratory disorder with AIDS

Tabular List NotesGuidance

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

Inclusion Terms

  • Candidal bronchitis
  • Candidal pneumonia

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.

    • Bronchomycosis NOS
      • candidal
    • Candidiasis, candidal
      • bronchitis
    • Candidiasis, candidal
      • lung
    • Candidiasis, candidal
      • pneumonia
    • Candidiasis, candidal
      • pulmonary
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • Candida
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • in (due to)
        • candidiasis

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

  • Neonatal Candidiasis

    a fungal infection by any of the candida species in a newborn infant up to 28 days old.

Patient EducationClinical

Lung Diseases

When you breathe, your lungs take in oxygen from the air and deliver it to the bloodstream. The cells in your body need oxygen to work and grow. During a normal day, you breathe nearly 25,000 times. People with lung disease have difficulty breathing. Millions of people in the U.S. have lung disease.

Read the full article at MedlinePlus

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

Convert B37.1 to ICD-9-CMHistory

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

ICD-9-CM
112.4 Candidiasis of lung
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 B37.1Overview

Is B37.1 (Candidiasis) a billable code?

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

What MS-DRG does B37.1 group to?

When pulmonary candidiasis 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 B37.1?

Under the General Equivalence Mappings, pulmonary candidiasis converts to ICD-9-CM 112.4 (candidiasis of lung). 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.