Blastomycosis, unspecified digital illustration

Blastomycosis, unspecified Save

ICD-10 code: B40.9

Chapter: Certain infectious and parasitic diseases

Blastomycosis, unspecified: Causes, Symptoms, and Treatment

Blastomycosis is a rare fungal infection caused by the fungus Blastomyces dermatitidis. It mainly affects the lungs and can cause severe respiratory symptoms. Blastomycosis is considered an opportunistic infection, meaning it affects people with weakened immune systems.

Causes of Blastomycosis

The fungus that causes blastomycosis is found in soil and decaying organic matter. When soil is disturbed, the fungus can become airborne and be inhaled by humans. Blastomycosis can also be contracted by handling infected animals, such as dogs and cats, or by being bitten by infected ticks.

Symptoms of Blastomycosis

The symptoms of blastomycosis can vary, and not everyone infected with the fungus will develop symptoms. However, some common symptoms of blastomycosis include:

  1. Chest pain
  2. Coughing, sometimes with blood
  3. Fever
  4. Fatigue
  5. Loss of appetite
  6. Night sweats
  7. Shortness of breath
  8. Muscle aches and joint pain
Treatment of Blastomycosis

If you suspect that you may have blastomycosis, it is important to see a healthcare provider for diagnosis and treatment. There are several different medications that can be used to treat blastomycosis, including antifungal medications like itraconazole and fluconazole.

In severe cases, hospitalization may be necessary to receive intravenous antifungal therapy. It is important to follow your healthcare provider's instructions closely and complete the entire course of treatment, even if your symptoms improve.

Preventing Blastomycosis

There are several steps you can take to help prevent blastomycosis. These include:

  • Avoiding areas with high levels of decaying organic matter
  • Avoiding handling infected animals, such as dogs and cats
  • Wearing gloves and protective clothing when gardening or handling soil
  • Using insect repellent to prevent tick bites
  • Cleaning up any areas of your yard or home that have a buildup of leaves or other decaying matter

By taking these steps, you can help reduce your risk of contracting blastomycosis and other fungal infections.


Blastomycosis is a rare fungal infection that mainly affects the lungs.

Diagnosis Codes for Blastomycosis, unspecified | B40.9