B40.9 – Blastomycosis, unspecified

ICD-10-CM 2027 diagnosis code · Mycoses

Billable code

ICD-10-CM code B40.9

Code: B40.9 (claims format: B409)
Description: Blastomycosis, unspecified
Billable: Yes – valid for HIPAA-covered transactions
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
Parent codes: B40

Notes inherited from parent codes

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

B40 – Blastomycosis

Excludes1 (not coded here):

Brazilian blastomycosis (B41.-)
keloidal blastomycosis (B48.0)

Block B35-B49

Excludes2 (not included here):

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

Index terms for B40.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in B40

B40.0 – Acute pulmonary blastomycosisBillable
B40.1 – Chronic pulmonary blastomycosisBillable
B40.2 – Pulmonary blastomycosis, unspecifiedBillable
B40.3 – Cutaneous blastomycosisBillable
B40.7 – Disseminated blastomycosisBillable
B40.8 – Other forms of blastomycosisHeader

Frequently asked questions

What is ICD-10 code B40.9?

B40.9 is the ICD-10-CM code for blastomycosis, unspecified, in the block B35-B49 (Mycoses).

Is B40.9 a billable code?

Yes. B40.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does B40.9 belong to?

It belongs to category B40 – Blastomycosis.

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.