Histoplasmosis (B39) ICD-10-CM
The B39 code range covers histoplasmosis with 8 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- associated AIDS B20
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
Codes in the B39 Range 8 codes · 7 billable
- B39 HistoplasmosisNon-billable
- B39.0 Acute pulmonary histoplasmosis capsulati
- B39.1 Chronic pulmonary histoplasmosis capsulati
- B39.2 Pulmonary histoplasmosis capsulati, unspecified
- B39.3 Disseminated histoplasmosis capsulati
- B39.4 Histoplasmosis capsulati, unspecified
- B39.5 Histoplasmosis duboisii
- B39.9 Histoplasmosis, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B39 range.
Histoplasmosis
Infection resulting from exposure to the fungus HISTOPLASMA.
About the B39 Code Range
Histoplasmosis is an infection resulting from exposure to the fungus Histoplasma. It appears among the mycoses, or fungal infections.
The subdivisions distinguish pulmonary (lung) histoplasmosis capsulati as acute, chronic, or unspecified. Separate codes identify disseminated histoplasmosis capsulati, histoplasmosis capsulati without further detail, histoplasmosis duboisii, and histoplasmosis without further detail.
Questions About This Page
How many billable codes are in the B39 range?
Of the 8 codes in this range, 7 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the B39 range classify?
The range classifies histoplasmosis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
