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ICD-10-CM B37.9: Candidiasis, unspecified

B37.9 is the billable ICD-10-CM code for candidiasis, unspecified, in category B37 (Candidiasis) of the Mycoses section. As a principal diagnosis it groups to MS-DRG 867 Other Infectious and Parasitic Diseases Diagnoses with MCC, MS-DRG 868 Other Infectious and Parasitic Diseases Diagnoses with CC, MS-DRG 869 Other Infectious and Parasitic Diseases Diagnoses without CC/MCC (MDC 18 MDC 18: Infectious and Parasitic Diseases, Systemic or Unspecified Sites); or MS-DRG 974 HIV with Major Related Condition with MCC, MS-DRG 975 HIV with Major Related Condition with CC, MS-DRG 976 HIV with Major Related Condition without CC/MCC (MDC 25 MDC 25: Human Immunodeficiency Virus Infections).

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
B37.9
billable FY2027 ICD-10-CM code
Category
B37 Candidiasis
Chapter
1: Certain infectious and parasitic diseases (A00-B99)
CC/MCC (MS-DRG v44)
Neither
CMS-HCC V28
Not mapped
POA reporting
Required

Tabular list notes for B37.9

The tabular list has no notes on B37.9 itself; the notes below apply from its parent headings.

Inherited from B37 (Candidiasis)

Includes
  • candidosis
  • moniliasis
Excludes1 (never coded together)
  • neonatal candidiasis (P37.5)

MS-DRG grouping when B37.9 is the principal diagnosis

MS-DRG v44 groups for B37.9 as principal diagnosis
MDCMS-DRGs
18 MDC 18: Infectious and Parasitic Diseases, Systemic or Unspecified Sites867868869
25 MDC 25: Human Immunodeficiency Virus Infections974975976

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for B37.9 shows the full grouping logic.

CC/MCC status and inpatient edits

B37.9 is neither a CC nor an MCC under MS-DRG v44, so as a secondary diagnosis it does not raise the MS-DRG severity level. Check B37.9 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.

CMS-HCC V28 risk adjustment

B37.9 does not map to a payment HCC in the PY2027 CMS-HCC V28 model, so on its own it does not change a Medicare Advantage risk score.

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Frequently asked questions

What does ICD-10-CM B37.9 mean?

B37.9 means candidiasis, unspecified. It is one of 17 billable codes under B37, candidiasis.

What can't be coded with B37.9?

Excludes1 at B37: neonatal candidiasis (P37.5). These are never reported together with B37.9.

Which MS-DRG does B37.9 group to?

As the principal diagnosis, B37.9 groups to MS-DRG 867 Other Infectious and Parasitic Diseases Diagnoses with MCC, MS-DRG 868 Other Infectious and Parasitic Diseases Diagnoses with CC, MS-DRG 869 Other Infectious and Parasitic Diseases Diagnoses without CC/MCC (MDC 18 MDC 18: Infectious and Parasitic Diseases, Systemic or Unspecified Sites); or MS-DRG 974 HIV with Major Related Condition with MCC, MS-DRG 975 HIV with Major Related Condition with CC, MS-DRG 976 HIV with Major Related Condition without CC/MCC (MDC 25 MDC 25: Human Immunodeficiency Virus Infections) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

The descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and the ICD-10-CM Official Guidelines. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.