2024 ICD-10-CM Diagnosis Code B40

Blastomycosis

  • B40 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2024 edition of ICD-10-CM B40 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of B40 – other international versions of ICD-10 B40 may differ.

Type 1 Excludes

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

The following code(s) above B40 contain annotation back-references

 that may be applicable to B40:

  • A00-B99  Certain infectious and parasitic diseases
  • B35-B49  Mycoses

Clinical Information

  • A fungal infection caused by inhalation of spores of blastomyces dermatitidis. It presents with flu-like symptoms including fever, chills, cough, pleuritic chest pain and myalgias. It may lead to a chronic granulomatous pulmonary infection and disseminate to other anatomic sites including skin, nervous system and bones.
  • A fungal infection 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.
  • Infection caused by fungi of the genus blastomyces.

Code History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change