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v1.0.0
ICD-10 Guide
ICD-10 CodesB44

B44

Aspergillosis

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

Code Description

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

Key Diagnostic Point:

Aspergillosis is a fungal infection caused by the Aspergillus species, primarily Aspergillus fumigatus, which can lead to a range of clinical manifestations. It is most commonly associated with respiratory infections, particularly in immunocompromised individuals, such as those with HIV/AIDS, cancer patients undergoing chemotherapy, or organ transplant recipients. The infection can present as allergic bronchopulmonary aspergillosis (ABPA), invasive aspergillosis, or chronic pulmonary aspergillosis, each with distinct clinical features and treatment approaches. Symptoms may include cough, fever, chest pain, and hemoptysis. Diagnosis typically involves imaging studies, such as CT scans, and microbiological cultures. Treatment often requires antifungal medications, such as voriconazole or amphotericin B, and may necessitate surgical intervention in severe cases. The management of aspergillosis is particularly challenging in patients with weakened immune systems, necessitating careful monitoring and tailored therapeutic strategies.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Variety of clinical presentations (e.g., invasive vs. non-invasive)
  • Differential diagnosis with other respiratory conditions
  • Need for precise documentation of immunocompromised status
  • Variability in treatment protocols based on patient condition

Audit Risk Factors

  • Inadequate documentation of immunocompromised status
  • Failure to specify the type of aspergillosis
  • Misclassification of the severity of the infection
  • Lack of supporting diagnostic tests in the medical record

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history, including immunocompromised status and previous infections.

Common Clinical Scenarios

Patients presenting with respiratory symptoms and a history of immunosuppression.

Billing Considerations

Ensure clear documentation of the type of aspergillosis and treatment response.

Pulmonology

Documentation Requirements

Pulmonary function tests, imaging results, and treatment plans.

Common Clinical Scenarios

Patients with chronic cough and hemoptysis, particularly those with underlying lung disease.

Billing Considerations

Document any co-existing lung conditions that may complicate the diagnosis.

Coding Guidelines

Inclusion Criteria

Use B44 When
  • Follow the official ICD
  • CM coding guidelines for infectious diseases, ensuring accurate documentation of the patient's immunocompromised status and the specific type of aspergillosis
  • Include any relevant laboratory results and imaging studies

Exclusion Criteria

Do NOT use B44 When
No specific exclusions found.

Related Codes

Child Codes

8 codes
B44.0
Disseminated aspergillosis
B44.1
Disseminated cutaneous sporotrichosis
B44.2
Disseminated cutaneous histoplasmosis
B44.7
Aspergillosis of lung
B44.8
Other forms of aspergillosis
B44.81
Allergic bronchopulmonary aspergillosis
B44.89
Other forms of aspergillosis
B44.9
Aspergillosis, unspecified

Related CPT Codes

J8499CPT Code

Unclassified drugs

Clinical Scenario

Used when administering antifungal medications not classified under specific codes.

Documentation Requirements

Document the specific antifungal agent used and the reason for its use.

Specialty Considerations

Infectious disease specialists should ensure that the rationale for unclassified drugs is clearly stated.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of aspergillosis, improving the ability to capture the complexity of the disease and its various manifestations, which aids in better patient management and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of aspergillosis, improving the ability to capture the complexity of the disease and its various manifestations, which aids in better patient management and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of aspergillosis, improving the ability to capture the complexity of the disease and its various manifestations, which aids in better patient management and resource allocation.

Resources

Clinical References

  • •
    CDC Aspergillosis Information

Coding & Billing References

  • •
    CDC Aspergillosis Information

Frequently Asked Questions

What are the common symptoms of aspergillosis?

Common symptoms include cough, fever, chest pain, and hemoptysis, particularly in immunocompromised patients.

How is aspergillosis diagnosed?

Diagnosis typically involves imaging studies, microbiological cultures, and clinical evaluation of symptoms.

What treatments are available for aspergillosis?

Treatment often includes antifungal medications such as voriconazole or amphotericin B, and may require surgical intervention in severe cases.