ICD-10 Code B44.0 – Invasive pulmonary aspergillosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B44.0 – Invasive pulmonary aspergillosis
What it is
B44.0 identifies an invasive Aspergillus infection involving the lungs. Use it when documentation states pulmonary aspergillosis with tissue invasion, not simple colonization or an unspecified fungal finding.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include cough, fever, chest pain, dyspnea, and imaging changes consistent with invasive pulmonary disease.
When to use this code
Use B44.0 when the provider documents invasive pulmonary aspergillosis, aspergillus pneumonia, or equivalent wording showing lung invasion. Code it from the final diagnosis or confirmed assessment, not from suspicion alone. Check documentation if the record only says aspergillosis without site or invasiveness.
Do not use for
Do not use this code for allergic bronchopulmonary aspergillosis, aspergilloma, or noninvasive colonization. If the organism is suspected but not confirmed, check documentation and follow the provider’s stated diagnosis.
Coding tip
Confirm both the pulmonary site and invasive nature in the note before assigning B44.0.