ICD-10 Code B44.1 – Other pulmonary aspergillosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B44.1 – Other pulmonary aspergillosis
What it is
B44.1 identifies pulmonary aspergillosis that does not fit a more specific ICD-10 category. Use it for lung involvement caused by Aspergillus when the record supports a pulmonary form but not another named subtype.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe respiratory symptoms, abnormal chest imaging, or evidence of Aspergillus infection involving the lungs.
When to use this code
Use B44.1 when the provider documents other pulmonary aspergillosis, aspergillosis of the lung, or a pulmonary Aspergillus infection that is not classified elsewhere. This code is appropriate when the chart clearly supports lung involvement but does not specify allergic, invasive, or another more exact form. Check documentation if the site or type is unclear.
Do not use for
Do not use this code for nonpulmonary aspergillosis or for pulmonary aspergillosis with a more specific documented subtype. If the record only says Aspergillus exposure or colonization without disease, check documentation.
Coding tip
Assign B44.1 only when the note explicitly ties aspergillosis to the lungs and no more specific code is supported.