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v1.0.0
ICD-10 Guide
ICD-10 CodesA32.0

A32.0

Lassa fever

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

Code Description

ICD-10 A32.0 is a billable code used to indicate a diagnosis of lassa fever.

Key Diagnostic Point:

Lassa fever is an acute viral hemorrhagic illness caused by the Lassa virus, a member of the Arenaviridae family. It is endemic in parts of West Africa, particularly in Nigeria, Sierra Leone, Liberia, and Guinea. The disease is primarily transmitted to humans through contact with the urine or feces of infected Mastomys rats, which are common in these regions. Symptoms typically appear 1-3 weeks after exposure and can range from mild to severe, including fever, weakness, headaches, and gastrointestinal symptoms. In severe cases, Lassa fever can lead to hemorrhagic manifestations, multi-organ failure, and death. Diagnosis is often confirmed through serological testing or PCR. Treatment primarily involves supportive care, and the antiviral drug ribavirin has shown efficacy if administered early in the course of the disease. Preventive measures focus on rodent control and minimizing contact with potentially infected materials. Due to its potential for outbreaks and public health implications, Lassa fever is a significant concern in endemic regions.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of symptoms
  • Need for specific laboratory confirmation for accurate diagnosis
  • Potential for co-infection with other viral hemorrhagic fevers
  • Geographic specificity of the disease and its endemic nature

Audit Risk Factors

  • Inadequate documentation of exposure history
  • Misdiagnosis due to symptom overlap with other febrile illnesses
  • Failure to document laboratory confirmation
  • Inconsistent coding of related symptoms or complications

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history, including travel and exposure history, laboratory results, and clinical symptoms.

Common Clinical Scenarios

Patients presenting with fever and travel history to endemic regions, suspected cases of viral hemorrhagic fever.

Billing Considerations

Ensure accurate documentation of laboratory tests and clinical findings to support the diagnosis.

Emergency Medicine

Documentation Requirements

Immediate assessment of symptoms, travel history, and initial laboratory tests.

Common Clinical Scenarios

Patients presenting with acute febrile illness after travel to West Africa.

Billing Considerations

Rapid identification and documentation of potential exposure to facilitate timely treatment.

Coding Guidelines

Inclusion Criteria

Use A32.0 When
  • Follow the official ICD
  • CM coding guidelines for infectious diseases, ensuring accurate documentation of the patient's clinical presentation and laboratory confirmation
  • Include any relevant co
  • morbidities or complications

Exclusion Criteria

Do NOT use A32.0 When
No specific exclusions found.

Related CPT Codes

87522CPT Code

Infectious agent detection by nucleic acid (DNA or RNA); direct probe technique

Clinical Scenario

Used for confirming Lassa fever through PCR testing.

Documentation Requirements

Document the reason for testing and the patient's travel history.

Specialty Considerations

Infectious disease specialists should ensure comprehensive documentation of clinical findings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of Lassa fever, improving data collection and public health tracking of this disease.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of Lassa fever, improving data collection and public health tracking of this disease.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of Lassa fever, improving data collection and public health tracking of this disease.

Resources

Clinical References

  • •
    CDC Lassa Fever Information

Coding & Billing References

  • •
    CDC Lassa Fever Information

Frequently Asked Questions

What are the primary symptoms of Lassa fever?

Primary symptoms include fever, weakness, headaches, vomiting, and in severe cases, bleeding and multi-organ failure.

How is Lassa fever diagnosed?

Diagnosis is confirmed through serological testing or PCR, along with a thorough patient history of exposure.