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ICD-10 Guide
DiagnosesAspergillus Pneumonia

Aspergillus Pneumonia

ICD-10 Coding for Aspergillus Pneumonia(B44.0, B44.1, J17.2)

PRIMARY SPECIALTYInfectious Disease
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Aspergillus Pneumonia?
Essential facts and insights about Aspergillus Pneumonia

Key Clinical Considerations:

  • Patients typically present with cough, fever, chest pain, and dyspnea.
  • Laboratory findings may include positive cultures for Aspergillus species from respiratory secretions or tissue samples.
  • Physical examination may reveal decreased breath sounds, crackles, or signs of respiratory distress.
  • Imaging studies such as chest X-rays or CT scans may show nodules, cavitary lesions, or ground-glass opacities.
  • Severity criteria may include the extent of lung involvement and the presence of underlying immunocompromised states.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the patient's symptoms, clinical findings, and diagnostic tests performed.
  • Specific terminology such as 'Aspergillus pneumonia' or 'pulmonary aspergillosis' must be used.
  • Examples include documenting the patient's immunocompromised status and any relevant comorbidities.
  • Medical necessity must be established through documentation of symptoms and the need for diagnostic testing.
  • Quality measures may include tracking the appropriateness of antifungal therapy and follow-up imaging.

Coding Guidelines

Usage Guidelines & Examples

  • Use B44.0 for invasive pulmonary aspergillosis in immunocompromised patients and B44.1 for allergic bronchopulmonary aspergillosis.
  • Do not use these codes for non-pulmonary aspergillosis or other fungal infections.
  • B44.9 is a related code for unspecified aspergillosis but should be avoided if a more specific diagnosis is available.
  • Common errors include misclassifying allergic forms as invasive; ensure clinical context is clear.
  • In complex cases, consider the patient's overall clinical picture and any co-existing conditions.

Code Exclusions

Important Exclusions

  • Excludes conditions like non-infectious lung diseases or other types of pneumonia not caused by Aspergillus.
  • Alternative codes for excluded conditions include J18 for unspecified pneumonia.
  • Conditions are excluded to ensure accurate representation of the specific infectious process.
  • Common mistakes include coding aspergillosis when the patient has a different type of pneumonia.
  • Related but distinct conditions include other fungal infections like histoplasmosis or coccidioidomycosis.

Related ICD-10 Codes

Primary Codes
B44.0
Invasive pulmonary aspergillosis
B44.1
Allergic bronchopulmonary aspergillosis
J17.2
Pneumonia due to other specified infectious organisms
Ancillary Codes
T86.818
Differential Codes
B44.1
B44.0

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Infectious Disease

Specialty Applications

  • Applies to patients with underlying lung disease, immunocompromised states, or those with prolonged corticosteroid use.
  • Patient populations include those with HIV/AIDS, cancer, or organ transplant recipients.
  • Clinical settings include inpatient hospitalizations, outpatient clinics, and emergency departments.
  • Specialty-specific applications are relevant in infectious disease, pulmonology, and critical care.
  • Treatment contexts include antifungal therapy initiation and monitoring for treatment response.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Patient diagnosed with Aspergillus pneumonia based on clinical findings of cough and fever.'

Template 2

Template: 'Clinical presentation consistent with Aspergillus pneumonia including dyspnea and chest pain.'

Template 3

Template: 'Diagnostic criteria for Aspergillus pneumonia met as evidenced by positive culture results.'

Template 4

Template: 'Treatment plan initiated for Aspergillus pneumonia with voriconazole prescribed.'

Template 5

Template: 'Follow-up care for Aspergillus pneumonia including monitoring of respiratory status and imaging.'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this diagnosis?

Documentation must include clinical symptoms, diagnostic tests, and treatment plans.

How does this differ from similar diagnoses?

Aspergillus pneumonia is distinct from other fungal pneumonias due to its specific causative organism.

What are common billing considerations?

Ensure that the diagnosis is supported by clinical documentation to optimize reimbursement.

What procedures are typically associated?

CPT codes for bronchoscopy or imaging studies may be relevant for diagnosis.

Are there any quality reporting implications?

Quality measures may include tracking treatment outcomes and adherence to antifungal guidelines.