NPI Atlas

B39 – Histoplasmosis

ICD-10-CM 2027 diagnosis code · Mycoses

Non-billable header

ICD-10-CM code B39

Code: B39 (claims format: B39)
Description: Histoplasmosis
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: B35-B49 Mycoses

Billable codes under B39

B39 is a header code and cannot be used on claims. Choose the most specific code:

B39.0 – Acute pulmonary histoplasmosis capsulatiBillable
B39.1 – Chronic pulmonary histoplasmosis capsulatiBillable
B39.2 – Pulmonary histoplasmosis capsulati, unspecifiedBillable
B39.3 – Disseminated histoplasmosis capsulatiBillable
B39.4 – Histoplasmosis capsulati, unspecifiedBillable
B39.5 – Histoplasmosis duboisiiBillable
B39.9 – Histoplasmosis, unspecifiedBillable

Notes for B39

Code first:

associated AIDS (B20)

Use additional code:

code for any associated manifestations, such as:
endocarditis (I39)
meningitis (G02)
pericarditis (I32)
retinitis (H32)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block B35-B49

Excludes2 (not included here):

hypersensitivity pneumonitis due to organic dust (J67.-)
mycosis fungoides (C84.0-)

Frequently asked questions

What is ICD-10 code B39?

B39 is the ICD-10-CM code for histoplasmosis, in the block B35-B49 (Mycoses).

Is B39 a billable code?

No. B39 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.