2026 ICD-10-CM Diagnosis Code B37.9Candidiasis, unspecified

ICD-10-CM Codes›A00–B99›B35-B49›B37

ICD-10-CM B37.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B37.9 is a billable ICD-10-CM diagnosis code for candidiasis, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.

Code Identity

ICD-10-CM Code
B37.9
Billable Status
Yes — Valid for Submission
Code Describes
Candidiasis, unspecified
Short Description
Candidiasis, unspecified
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 CodeB37.9Candidiasis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Candida albicans or Candida dubliniensis
  • Candida inconspicua or Candida norvegensis
  • Candidiasis
  • Chronic acquired mucocutaneous candidiasis
  • Chronic diffuse mucocutaneous candidiasis
  • Chronic localized mucocutaneous candidiasis
  • Chronic mucocutaneous candidiasis
  • Familial chronic mucocutaneous candidiasis
  • Familial chronic mucocutaneous candidiasis - dominant type
  • Familial chronic mucocutaneous candidiasis - late onset type
  • Familial chronic mucocutaneous candidiasis - recessive type
  • Infection by Candida albicans
  • Infection caused by Candida auris
  • Invasive candidiasis
  • Localized candidiasis

Tabular List NotesGuidance

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

Inclusion Terms

  • Thrush NOS

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.

    • Candidiasis, candidal
    • Infection, infected, infective(opportunistic)
      • Oidium albicans
    • Infection, infected, infective(opportunistic)
      • yeast
    • Moniliasis
    • Saccharomyces infection
    • Yeast infection

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

  • Candidiasis

    infection with a fungus of the genus candida. it is usually a superficial infection of the moist areas of the body and is generally caused by candida albicans. (dorland, 27th ed)

  • Candidiasis, Chronic Mucocutaneous

    a clinical syndrome characterized by development, usually in infancy or childhood, of a chronic, often widespread candidiasis of skin, nails, and mucous membranes. it may be secondary to one of the immunodeficiency syndromes, inherited as an autosomal recessive trait, or associated with defects in cell-mediated immunity, endocrine disorders, dental stomatitis, or malignancy.

  • Candidiasis, Cutaneous

    candidiasis of the skin manifested as eczema-like lesions of the interdigital spaces, perleche, or chronic paronychia. (dorland, 27th ed)

  • Candidiasis, Invasive

    an important nosocomial fungal infection with species of the genus candida, most frequently candida albicans. invasive candidiasis occurs when candidiasis goes beyond a superficial infection and manifests as candidemia, deep tissue infection, or disseminated disease with deep organ involvement.

  • Candidiasis, Oral

    infection of the mucous membranes of the mouth by a fungus of the genus candida. (dorland, 27th ed)

  • Candidiasis, Vulvovaginal

    infection of the vulva and vagina with a fungus of the genus candida.

  • Candida

    a genus of yeast-like mitosporic saccharomycetales fungi characterized by producing yeast cells, mycelia, pseudomycelia, and blastophores. it is commonly part of the normal flora of the skin, mouth, intestinal tract, and vagina, but can cause a variety of infections, including candidiasis; onychomycosis; vulvovaginal candidiasis; and candidiasis, oral (thrush).

  • Invasive Candidiasis

    a fungal infection by any of the candida species in a sterile body compartment.

  • Chronic Mucocutaneous Candidiasis

    mucocutaneous candidiasis that is persistent or long-standing in nature.

Patient EducationClinical

Yeast Infections

Candida is the scientific name for yeast. It is a fungus that lives almost everywhere, including in your body. Usually, your immune system keeps yeast under control. If you are sick or taking antibiotics, it can multiply and cause an infection.

Read the full article at MedlinePlus

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

Convert B37.9 to ICD-9-CMHistory

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

ICD-9-CM
112.9 Candidiasis site 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 B37.9Overview

Is B37.9 (Candidiasis) a billable code?

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

What MS-DRG does B37.9 group to?

When candidiasis, 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 B37.9?

Under the General Equivalence Mappings, candidiasis, unspecified converts to ICD-9-CM 112.9 (candidiasis site 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.