ICD-10-CM 2027
ICD-10 code for histoplasmosis
From the official ICD-10-CM alphabetic index entry “Histoplasmosis”. Page updated September 29, 2026.
About coding histoplasmosis
The ICD-10-CM code for histoplasmosis is B39.9 (Histoplasmosis, unspecified). The official index lists 11 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on B39.9.
Within B39, choose B39.9 (unspecified) only when documentation doesn't support a more specific option: acute pulmonary histoplasmosis capsulati (B39.0), chronic pulmonary histoplasmosis capsulati (B39.1), pulmonary histoplasmosis capsulati, unspecified (B39.2), disseminated histoplasmosis capsulati (B39.3), capsulati, unspecified (B39.4) and duboisii (B39.5).
Code first: associated AIDS (B20).
Use an additional code for any associated manifestations, such as: endocarditis (I39), meningitis (G02), pericarditis (I32) and retinitis (H32).
More specific histoplasmosis codes (official index)
- with pneumonia NEC B39.2 — Pulmonary histoplasmosis capsulati, unspecified
- African B39.5 — Histoplasmosis duboisii
- American
- capsulati B39.4 — Histoplasmosis capsulati, unspecified
- disseminated B39.3 — Disseminated histoplasmosis capsulati
- generalized B39.3 — Disseminated histoplasmosis capsulati
- pulmonary B39.2 — Pulmonary histoplasmosis capsulati, unspecified
- acute B39.0 — Acute pulmonary histoplasmosis capsulati
- chronic B39.1 — Chronic pulmonary histoplasmosis capsulati
- Darling's B39.4 — Histoplasmosis capsulati, unspecified
- duboisii B39.5 — Histoplasmosis duboisii
- lung NEC B39.2 — Pulmonary histoplasmosis capsulati, unspecified
Common questions about histoplasmosis ICD-10 codes
What is the ICD-10 code for histoplasmosis?
- B39.9 — Histoplasmosis, unspecified. More specific codes apply when the documentation supports them: B39.2, B39.5, B39.4, B39.3 and others below.
What is the ICD-10 code for african histoplasmosis?
- B39.5 — Histoplasmosis duboisii.
What is the ICD-10 code for capsulati histoplasmosis?
- B39.4 — Histoplasmosis capsulati, unspecified.
What is the ICD-10 code for darling's histoplasmosis?
- B39.4 — Histoplasmosis capsulati, unspecified.
What is the ICD-10 code for duboisii histoplasmosis?
- B39.5 — Histoplasmosis duboisii.
What is the ICD-10 code for lung nec histoplasmosis?
- B39.2 — Pulmonary histoplasmosis capsulati, unspecified.
Is B39.9 billable?
- Yes. B39.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B39.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B39.9 as a principal diagnosis.
Is B39.9 a CC or MCC?
- No. B39.9 is neither a CC nor an MCC under MS-DRG v44.0.