2026 ICD-10-CM Diagnosis Code B44Aspergillosis

ICD-10-CM Codes›A00–B99›B35-B49›B44

ICD-10-CM B44
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B44 is a non-billable ICD-10-CM category code for aspergillosis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B44.0, B44.1, B44.2, and B44.7.

Code Identity

ICD-10-CM Code
B44
Billable Status
No — Non-Billable Category
Code Describes
Aspergillosis
Chapter
B35-B49
Mycoses

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB44Aspergillosis
This CodeB44Aspergillosis

Specific Coding for AspergillosisOverview

Non-specific codes like B44 require more characters. Use one of these billable codes instead:

  • Use B44.0 for Invasive pulmonary aspergillosis

  • Use B44.1 for Other pulmonary aspergillosis

  • Use B44.2 for Tonsillar aspergillosis

  • Use B44.7 for Disseminated aspergillosis

  • B44.8 for Other forms of aspergillosis

  • Use B44.81 for Allergic bronchopulmonary aspergillosis

  • Use B44.89 for Other forms of aspergillosis

  • Use B44.9 for Aspergillosis, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • aspergilloma

Clinical InformationClinical

  • 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.

  • 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.

  • Aspergillus

    a genus of mitosporic fungi containing about 100 species and eleven different teleomorphs in the family trichocomaceae.

Patient EducationClinical

Aspergillosis

Aspergillosis is a disease caused by a fungus (or mold) called Aspergillus. The fungus is very common in both indoors and outdoors. Most people breathe in the spores of the fungus every day without being affected. But some people get the disease. It usually occurs in people with lung diseases or weakened immune systems.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B44Overview

Is B44 (Aspergillosis) a billable code?

No. This is a category header that groups the codes for aspergillosis, and headers cannot be submitted on claims. Claims for aspergillosis need a more specific code from this category, such as B44.0, B44.1, and B44.2.