Aspergillosis (B44) ICD-10-CM
The B44 code range covers aspergillosis with 9 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- aspergilloma
Codes in the B44 Range 9 codes · 7 billable
- B44 AspergillosisNon-billable
- B44.0 Invasive pulmonary aspergillosis
- B44.1 Other pulmonary aspergillosis
- B44.2 Tonsillar aspergillosis
- B44.7 Disseminated aspergillosis
- B44.8 Other forms of aspergillosisNon-billable
- B44.81 Allergic bronchopulmonary aspergillosis
- B44.89 Other forms of aspergillosis
- B44.9 Aspergillosis, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B44 range.
Aspergillosis
Infections with fungi of the genus ASPERGILLUS.
Aspergillosis, Allergic Bronchopulmonary
Hypersensitivity reaction (ALLERGIC REACTION) to fungus ASPERGILLUS in an individual with long-standing BRONCHIAL ASTHMA. It is characterized by pulmonary infiltrates, EOSINOPHILIA, elevated serum IMMUNOGLOBULIN E, and skin reactivity to Aspergillus antigen.
Aspergillus
A genus of mitosporic fungi containing about 100 species and eleven different teleomorphs in the family Trichocomaceae.
Invasive Pulmonary Aspergillosis
Lung infections with the invasive forms of ASPERGILLUS, usually after surgery, transplantation, prolonged NEUTROPENIA or treatment with high-doses of CORTICOSTEROIDS. Invasive pulmonary aspergillosis can progress to CHRONIC NECROTIZING PULMONARY ASPERGILLOSIS or hematogenous spread to other organs.
Neuroaspergillosis
Infections of the nervous system caused by fungi of the genus ASPERGILLUS, most commonly ASPERGILLUS FUMIGATUS. Aspergillus infections may occur in immunocompetent hosts, but are more prevalent in individuals with IMMUNOLOGIC DEFICIENCY SYNDROMES. The organism may spread to the nervous system from focal infections in the lung, mastoid region, sinuses, inner ear, bones, eyes, gastrointestinal tract, and heart. Sinus infections may be locally invasive and enter the intracranial compartment, producing MENINGITIS, FUNGAL; cranial neuropathies; and abscesses in the frontal lobes of the brain. (From Joynt, Clinical Neurology, 1998, Ch 27, pp62-3)
Pulmonary Aspergillosis
Infections of the respiratory tract with fungi of the genus ASPERGILLUS.
About the B44 Code Range
The ICD-10 codes in the B44 section categorize different types of aspergillosis, a range of infections caused by Aspergillus fungi. These codes help specify the exact form of aspergillosis diagnosed, from lung infections to allergic or disseminated forms.
ICD-10 code B44 refers broadly to aspergillosis infections. More specifically, B44.0 covers invasive pulmonary aspergillosis, also known as invasive fungal infection or subacute invasive pulmonary aspergillosis, which affects the lungs seriously. B44.1 includes other pulmonary aspergillosis varieties such as chronic fibrosing and cavitary types, often linked to pneumonia or bronchial inflammation caused by Aspergillus. Tonsillar aspergillosis is identified by B44.2. Disseminated or systemic forms, where infection spreads beyond the lungs, are coded as B44.7. Allergic bronchopulmonary aspergillosis, an allergic reaction affecting bronchial tubes, is classified under B44.81. There are also codes for other rare or unspecified aspergillosis infections, like cutaneous or cerebral aspergillosis (B44.89), and cases where the type is not specified (B44.9), which include several named infections by different Aspergillus species. Using these precise ICD-10 codes for aspergillosis supports accurate documentation and treatment planning by clearly reflecting each patient's specific fungal infection.
Questions About This Page
How many billable codes are in the B44 range?
Of the 9 codes in this range, 7 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the B44 range classify?
The range classifies aspergillosis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
