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v1.0.0
ICD-10 Guide
ICD-10 CodesB64

B64

Unspecified Filariasis

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

Code Description

ICD-10 B64 is a billable code used to indicate a diagnosis of unspecified filariasis.

Key Diagnostic Point:

Unspecified filariasis refers to a parasitic infection caused by filarial worms, which are transmitted to humans through the bites of infected mosquitoes. The condition is often associated with tropical and subtropical regions, where the vectors thrive. The most common filarial infections include lymphatic filariasis, which can lead to severe lymphedema and elephantiasis, and onchocerciasis, which can cause river blindness. Symptoms may vary widely, ranging from asymptomatic to severe manifestations, including swelling, pain, and skin changes. Diagnosis typically involves serological tests or identification of microfilariae in blood samples. Treatment protocols may include antiparasitic medications such as diethylcarbamazine (DEC) or ivermectin, depending on the specific type of filariasis. Management also focuses on alleviating symptoms and preventing secondary infections. Due to the complexity of the disease and its varied presentations, accurate coding is essential for appropriate treatment and reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of clinical presentations and symptoms
  • Differentiation from other tropical diseases
  • Need for specific diagnostic tests
  • Potential for co-infections with other parasites

Audit Risk Factors

  • Inadequate documentation of symptoms
  • Failure to specify the type of filariasis
  • Misidentification of related tropical diseases
  • Inconsistent use of diagnostic tests

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history, symptom description, diagnostic test results, and treatment plans.

Common Clinical Scenarios

Patients presenting with swelling, pain, or skin changes in endemic areas.

Billing Considerations

Ensure accurate documentation of travel history and exposure to vectors.

Tropical Medicine

Documentation Requirements

Comprehensive evaluation of symptoms, travel history, and potential exposure to filarial vectors.

Common Clinical Scenarios

Patients with chronic symptoms suggestive of filariasis in endemic regions.

Billing Considerations

Consider co-infections and other tropical diseases in differential diagnosis.

Coding Guidelines

Inclusion Criteria

Use B64 When
  • Follow official ICD
  • 10 coding guidelines, ensuring to document the clinical context and any relevant diagnostic tests

Exclusion Criteria

Do NOT use B64 When
  • Exclude codes for specific types of filariasis unless they are clearly identified

Related CPT Codes

87390CPT Code

Serologic test for filarial infection

Clinical Scenario

Used when testing for filariasis in symptomatic patients.

Documentation Requirements

Document the reason for testing and any relevant symptoms.

Specialty Considerations

Infectious disease specialists should ensure comprehensive evaluation.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of filariasis, improving the ability to capture the complexity of the disease and its various presentations.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of filariasis, improving the ability to capture the complexity of the disease and its various presentations.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of filariasis, improving the ability to capture the complexity of the disease and its various presentations.

Resources

Clinical References

  • •
    CDC Filariasis Information

Coding & Billing References

  • •
    CDC Filariasis Information

Frequently Asked Questions

What is the primary cause of unspecified filariasis?

Unspecified filariasis is primarily caused by filarial worms transmitted through mosquito bites, leading to various clinical manifestations.

How is filariasis diagnosed?

Diagnosis typically involves clinical evaluation, serological tests, and identification of microfilariae in blood samples.

What are the treatment options for filariasis?

Treatment may include antiparasitic medications such as diethylcarbamazine (DEC) or ivermectin, along with supportive care for symptoms.