B40.9
✓ BillableBlastomycosis, unspecified
Certain infectious and parasitic diseases (A00-B99)
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • Brazilian blastomycosis (B41.-)
- • keloidal blastomycosis (B48.0)
Clinical Description
ICD-10-CM code B40.9 represents blastomycosis, unspecified. This code falls under the Certain infectious and parasitic diseases (A00-B99) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 5-character code at the 4th level of specificity. This is the most specific code available in this subcategory. Coders should note that B40.9 has 2 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code B40.9?
ICD-10-CM code B40.9 is "Blastomycosis, unspecified". It belongs to the category: Certain infectious and parasitic diseases (A00-B99).
Is B40.9 a billable ICD-10 code?
Yes, B40.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
What codes are excluded with B40.9?
B40.9 has 2 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Related Codes in B40
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)