Blastomycosis (B40) ICD-10-CM
The B40 code range covers blastomycosis with 10 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the B40 Range 10 codes · 8 billable
- B40 BlastomycosisNon-billable
- B40.0 Acute pulmonary blastomycosis
- B40.1 Chronic pulmonary blastomycosis
- B40.2 Pulmonary blastomycosis, unspecified
- B40.3 Cutaneous blastomycosis
- B40.7 Disseminated blastomycosis
- B40.8 Other forms of blastomycosisNon-billable
- B40.81 Blastomycotic meningoencephalitis
- B40.89 Other forms of blastomycosis
- B40.9 Blastomycosis, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B40 range.
Blastomycosis
A fungal infection by BLASTOMYCES that may appear in two forms: 1, a primary lesion characterized by the formation of a small cutaneous nodule and small nodules along the lymphatics that may heal within several months; and 2, chronic granulomatous lesions characterized by thick crusts, warty growths, and unusual vascularity and infection in the middle or upper lobes of the lung.
About the B40 Code Range
Blastomycosis is a fungal infection caused by Blastomyces. Its codes distinguish infection in the lungs or skin, infection that has spread, and other or unspecified forms.
The lung codes separate acute B40.0, chronic B40.1, and unspecified B40.2 forms. B40.3 identifies skin involvement, while B40.7 identifies disseminated infection. Under other forms, B40.81 specifies inflammation of the brain and its surrounding membranes; B40.89 identifies other forms. B40.9 identifies blastomycosis without a specified form.
Questions About This Page
How many billable codes are in the B40 range?
Of the 10 codes in this range, 8 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the B40 range classify?
The range classifies blastomycosis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
