ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesB44.9

B44.9

Aspergillosis, unspecified

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 B44.9 is a billable code used to indicate a diagnosis of aspergillosis, unspecified.

Key Diagnostic Point:

Aspergillosis is a fungal infection caused by the Aspergillus species, which are ubiquitous in the environment. The infection can manifest in various forms, ranging from allergic reactions to invasive disease, particularly in immunocompromised individuals. The unspecified designation indicates that the specific type of aspergillosis has not been determined, which may include allergic bronchopulmonary aspergillosis (ABPA), chronic pulmonary aspergillosis, or invasive aspergillosis. Symptoms can vary widely, including cough, fever, chest pain, and difficulty breathing. Diagnosis typically involves imaging studies, such as CT scans, and microbiological cultures. Treatment often includes antifungal medications, such as voriconazole or amphotericin B, especially in severe cases. Patients with weakened immune systems, such as those undergoing chemotherapy or with HIV/AIDS, are at a higher risk for developing more severe forms of the disease. Prompt diagnosis and treatment are crucial to prevent complications and improve outcomes.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of the disease.
  • Need for specific documentation to differentiate between types of aspergillosis.
  • Potential overlap with other fungal infections, complicating coding.
  • Variability in treatment protocols based on patient immunocompetence.

Audit Risk Factors

  • Inadequate documentation of the patient's immunocompromised status.
  • Failure to specify the type of aspergillosis when applicable.
  • Lack of supporting diagnostic tests in the medical record.
  • Inconsistent coding practices across different healthcare providers.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed clinical notes on the patient's immune status, diagnostic tests performed, and treatment plans.

Common Clinical Scenarios

Patients presenting with respiratory symptoms and a history of immunosuppression.

Billing Considerations

Ensure that all relevant lab results and imaging studies are included in the documentation.

Pulmonology

Documentation Requirements

Thorough pulmonary function tests and imaging results to assess the extent of lung involvement.

Common Clinical Scenarios

Patients with chronic cough and suspected fungal infections.

Billing Considerations

Document any prior history of lung disease or immunosuppression.

Coding Guidelines

Inclusion Criteria

Use B44.9 When
  • According to ICD
  • 10 guidelines, B44
  • 9 should be used when the specific type of aspergillosis is not documented
  • Coders should ensure that the patient's clinical context supports the use of this code, particularly in relation to their immune status and any relevant diagnostic findings

Exclusion Criteria

Do NOT use B44.9 When
No specific exclusions found.

Related CPT Codes

87481CPT Code

Fungal culture

Clinical Scenario

Used when a fungal infection is suspected and cultures are needed.

Documentation Requirements

Document the reason for the culture and any relevant clinical findings.

Specialty Considerations

Infectious disease specialists should ensure comprehensive documentation of the patient's history.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of fungal infections, including aspergillosis. This has improved the ability to track and manage these infections, particularly in immunocompromised populations.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of fungal infections, including aspergillosis. This has improved the ability to track and manage these infections, particularly in immunocompromised populations.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of fungal infections, including aspergillosis. This has improved the ability to track and manage these infections, particularly in immunocompromised populations.

Resources

Clinical References

  • •
    CDC Aspergillosis Information

Coding & Billing References

  • •
    CDC Aspergillosis Information

Frequently Asked Questions

What is the difference between B44.9 and B44.0?

B44.9 is used for unspecified aspergillosis, while B44.0 is specifically for allergic bronchopulmonary aspergillosis. Accurate documentation is essential to determine the correct code.