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v1.0.0
ICD-10 Guide
ICD-10 CodesA84.0

A84.0

Tick-borne encephalitis virus disease

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

Code Description

ICD-10 A84.0 is a billable code used to indicate a diagnosis of tick-borne encephalitis virus disease.

Key Diagnostic Point:

Tick-borne encephalitis (TBE) is a viral infection caused by the tick-borne encephalitis virus (TBEV), which primarily affects the central nervous system (CNS). The disease is transmitted through the bite of infected ticks, particularly in rural areas where the virus is endemic. Clinically, TBE can present in three phases: an initial febrile phase, followed by a symptom-free interval, and then a neurological phase characterized by meningoencephalitis. Symptoms may include fever, headache, nausea, vomiting, and neurological manifestations such as confusion, seizures, and motor deficits. Complications can lead to long-term neurological sequelae, including cognitive impairment and motor dysfunction. Vaccination is available and recommended for individuals at high risk, such as those living in or traveling to endemic areas. The disease is more prevalent in certain geographical regions, particularly in Europe and Asia, and awareness of vaccination status is crucial for prevention and management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Varied clinical presentation and stages of the disease
  • Need for accurate documentation of neurological symptoms
  • Differentiation from other viral CNS infections
  • Vaccination status and its implications for coding

Audit Risk Factors

  • Inadequate documentation of neurological symptoms
  • Failure to document vaccination status
  • Misdiagnosis or coding of similar viral infections
  • Lack of clarity on the geographical exposure to ticks

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed history of exposure, vaccination status, and clinical symptoms.

Common Clinical Scenarios

Patients presenting with fever and neurological symptoms after tick exposure.

Billing Considerations

Consideration of co-infections and travel history.

Neurology

Documentation Requirements

Neurological examination findings, imaging results, and treatment plans.

Common Clinical Scenarios

Patients with acute encephalitis symptoms requiring neurological evaluation.

Billing Considerations

Differentiation from other causes of encephalitis.

Coding Guidelines

Inclusion Criteria

Use A84.0 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of the clinical presentation and any relevant history of tick exposure or vaccination
  • Include any neurological complications as secondary diagnoses

Exclusion Criteria

Do NOT use A84.0 When
No specific exclusions found.

Related CPT Codes

87491CPT Code

Infectious agent detection by nucleic acid (DNA or RNA); tick-borne encephalitis virus

Clinical Scenario

Used when testing for TBEV in patients with suspected tick-borne encephalitis.

Documentation Requirements

Document the clinical rationale for testing and any relevant symptoms.

Specialty Considerations

Infectious disease specialists should ensure comprehensive testing for tick-borne diseases.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of tick-borne diseases, improving the accuracy of epidemiological data and facilitating better patient management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of tick-borne diseases, improving the accuracy of epidemiological data and facilitating better patient management.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of tick-borne diseases, improving the accuracy of epidemiological data and facilitating better patient management.

Resources

Clinical References

  • •
    CDC Tick-Borne Diseases

Coding & Billing References

  • •
    CDC Tick-Borne Diseases

Frequently Asked Questions

What are the common symptoms of tick-borne encephalitis?

Common symptoms include fever, headache, nausea, vomiting, and neurological symptoms such as confusion, seizures, and motor deficits.

Is there a vaccine for tick-borne encephalitis?

Yes, a vaccine is available and recommended for individuals at high risk, particularly those living in or traveling to endemic areas.