2026 ICD-10-CM Diagnosis Code B44.81Allergic bronchopulmonary aspergillosis

ICD-10-CM Codes›A00–B99›B35-B49›B44

ICD-10-CM B44.81
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B44.81 is a billable ICD-10-CM diagnosis code for allergic bronchopulmonary aspergillosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 196 through 198. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Allergic reactions and Fungal infections.

Code Identity

ICD-10-CM Code
B44.81
Billable Status
Yes — Valid for Submission
Code Describes
Allergic bronchopulmonary aspergillosis
Short Description
Allergic bronchopulmonary aspergillosis
Same as the full description in the CMS dataset.
Parent Code
B44.8
Other forms of aspergillosis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB35-B49Mycoses
CategoryB44Aspergillosis
This CodeB44.81Allergic bronchopulmonary aspergillosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Allergic bronchopulmonary aspergillosis
  • Inflammation of bronchus caused by Aspergillus

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Aspergillosis(with pneumonia)
      • bronchopulmonary, allergic
    • Aspergillosis(with pneumonia)
      • pulmonary NEC
        • allergic

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ031
Allergic reactions
Default principal diagnosis: inpatient No · outpatient No
CCSR INF004
Fungal infections
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

Convert B44.81 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
518.6 Alrgc brncpul asprglosis
Exact Match The mapping is direct, with no qualifiers.

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 B44.81Overview

Is B44.81 (Other forms of aspergillosis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report allergic bronchopulmonary aspergillosis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B44.81 group to?

When allergic bronchopulmonary aspergillosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 196, 197, 198, with relative weights from 0.7162 to 1.8872 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B44.81?

Under the General Equivalence Mappings, allergic bronchopulmonary aspergillosis converts to ICD-9-CM 518.6 (alrgc brncpul asprglosis). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.