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ICD-10-CM 2027

ICD-10 code for Cytomycosis

B39.4

Histoplasmosis capsulati, unspecified

✓ Billable / specific

From the official ICD-10-CM alphabetic index entry “Cytomycosis (reticuloendothelial)”. Page updated September 29, 2026.

About coding Cytomycosis

The ICD-10-CM code for Cytomycosis is B39.4 (Histoplasmosis capsulati, unspecified).

Within B39, choose B39.4 (capsulati, 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), duboisii (B39.5) and unspecified (B39.9).

Code first: associated AIDS (B20).

Use an additional code for any associated manifestations, such as: endocarditis (I39), meningitis (G02), pericarditis (I32) and retinitis (H32).

Common questions about Cytomycosis ICD-10 codes

What is the ICD-10 code for Cytomycosis?

B39.4 — Histoplasmosis capsulati, unspecified.

Is B39.4 billable?

Yes. B39.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can B39.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict B39.4 as a principal diagnosis.

Is B39.4 a CC or MCC?

No. B39.4 is neither a CC nor an MCC under MS-DRG v44.0.