Blastomycosis is a rare fungal infection usually acquired by breathing in the spores of the fungi Blastomyces dermatitidis or Blastomyces gilchristii. These fungi can be found in moist soils, particularly in wooded areas and along waterways. 

Cause of Blastomycosis

Blastomycosis is a rare infectious disease caused by the fungus Blastomyces dermatitidis. This fungus grows and is inhaled through mold spores. In the body, the fungus converts to yeasts and invades the lungs. It travels throughout the body through the blood. Blastomycosis usually affects people with a compromised immune system.

Symptoms of Blastomycosis

Approximately half of the people who are infected with the fungus Blastomyces will show symptoms. The symptoms of blastomycosis are often similar to the symptoms of other lung infections, and can include:

  • Fever
  • Cough
  • Night sweats
  • Muscle aches or joint pain
  • Weight loss
  • Chest pain
  • Fatigue (extreme tiredness)


The healthcare provider will perform a physical examination. You'll be asked about your medical history and symptoms.

If the provider suspects you have a fungal infection, diagnosis can be confirmed by these tests:

  • Chest CT scan
  • Chest x-ray
  • Skin biopsy
  • Sputum culture and examination
  • Urinary antigen detection
  • Tissue biopsy and culture
  • Urine culture

General Rating Formula for Mycotic Lung Disease (diagnostic codes 6834 through 6839):

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