B39.4 ICD-10-CM Code: Histoplasmosis capsulati, unspecified
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Mycoses (B35-B49)
B39.4
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceHistoplasmosis capsulati, unspecified
A fungal infection caused by Histoplasma capsulatum with unspecified location or manifestation in the body.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- American histoplasmosis
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for B39.4 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for B39.4 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for B39.4 in this effective period.
Code First
Official- associated AIDS (B20)
Use Additional
Official- code for any associated manifestations, such as:
- endocarditis (I39)
- meningitis (G02)
- pericarditis (I32)
- retinitis (H32)
Code Also
OfficialICD-10-CM does not list Code Also instructions for B39.4 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is B39.4 an HCC code?
No. B39.4 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- B39.4
- Description
- Histoplasmosis capsulati, unspecified
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
B39.4 is the ICD-10-CM diagnosis code for histoplasmosis capsulati, unspecified. A fungal infection caused by Histoplasma capsulatum with unspecified location or manifestation in the body. B39.4 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering mycoses (b35-b49).
B39.4 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
This is a non-specific code; use only when the site of infection and clinical form are not documented.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for B39.4 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a non-specific code; use only when the site of infection and clinical form are not documented
- •Request additional documentation to determine if infection is pulmonary, disseminated, or localized elsewhere