ICD-10 Code for Blastomycosis
The ICD-10-CM code for blastomycosis is B40.9 — Blastomycosis, unspecified. This is the code the Alphabetic Index gives for blastomycosis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
B40.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which blastomycosis code should you use?
The Alphabetic Index lists 8 codes under Blastomycosis, blastomycotic. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| cutaneous | B40.3 | Cutaneous blastomycosis | |
| disseminated | B40.7 | Disseminated blastomycosis | |
| generalized | B40.7 | Disseminated blastomycosis | |
| keloidal | B48.0 | Lobomycosis | |
| North American | B40.9 | Blastomycosis, unspecified | |
| primary pulmonary | B40.0 | Acute pulmonary blastomycosis | |
| pulmonary | B40.2 | Pulmonary blastomycosis, unspecified | |
| skin | B40.3 | Cutaneous blastomycosis | |
| specified NEC | B40.89 | Other forms of blastomycosis |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources