ICD-10 Code B44 – Aspergillosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B44 – Aspergillosis
What it is
B44 identifies aspergillosis, an infection or allergic disease caused by Aspergillus fungi. Use it when the record documents this fungal condition, not merely exposure or colonization.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include respiratory symptoms, cough, fever, wheezing, or signs of invasive fungal disease in susceptible patients.
When to use this code
Use B44 when the provider diagnoses aspergillosis and links the condition to the encounter. It applies whether the record describes pulmonary, allergic, or other aspergillus-related disease, if not further specified elsewhere. Check documentation for the exact clinical form.
Do not use for
Do not use this code for simple Aspergillus colonization, exposure, or a suspected fungal infection without confirmation. If the chart names a more specific aspergillosis type, code that specific diagnosis instead.
Coding tip
Review the provider’s wording carefully and code the most specific aspergillosis type documented.