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v1.0.0
ICD-10 Guide
ICD-10 CodesA83.1

A83.1

Japanese encephalitis.

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

Code Description

ICD-10 A83.1 is a billable code used to indicate a diagnosis of japanese encephalitis..

Key Diagnostic Point:

Japanese encephalitis (JE) is a viral infection caused by the Japanese encephalitis virus (JEV), which is primarily transmitted through the bite of infected mosquitoes, particularly in rural agricultural areas of Asia. The disease can lead to severe neurological complications, including encephalitis, which is characterized by inflammation of the brain. Symptoms typically begin with fever, headache, and vomiting, progressing to neurological manifestations such as seizures, altered mental status, and paralysis. The incidence of JE is highest in children, and while many infections are asymptomatic, a significant proportion can lead to severe outcomes, including death or long-term neurological deficits. Vaccination is the most effective preventive measure, especially for individuals living in or traveling to endemic areas. The JE vaccine is recommended for those at risk, including travelers to high-risk regions, and is typically administered in a two-dose series. Early diagnosis and supportive care are crucial for improving outcomes in affected individuals.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between JE and other viral encephalitides.
  • Understanding vaccination history and its implications for coding.
  • Documenting neurological complications accurately.
  • Identifying the geographic risk factors associated with the disease.

Audit Risk Factors

  • Inadequate documentation of vaccination status.
  • Failure to specify the neurological complications.
  • Misclassification of the type of encephalitis.
  • Lack of clarity on the geographic exposure history.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed travel history, vaccination records, and clinical symptoms.

Common Clinical Scenarios

Patients presenting with fever and neurological symptoms after travel to endemic areas.

Billing Considerations

Ensure vaccination status is documented to support coding.

Neurology

Documentation Requirements

Neurological examination findings, imaging results, and treatment plans.

Common Clinical Scenarios

Patients with acute encephalitis symptoms requiring neurological evaluation.

Billing Considerations

Document all neurological deficits and complications for accurate coding.

Coding Guidelines

Inclusion Criteria

Use A83.1 When
  • According to ICD
  • 10 guidelines, A83
  • 1 should be used when the clinical documentation supports a diagnosis of Japanese encephalitis
  • It is important to include any relevant complications and vaccination history

Exclusion Criteria

Do NOT use A83.1 When
  • Exclude codes for other types of viral encephalitis unless specified

Related CPT Codes

86788CPT Code

Japanese encephalitis virus antibody test

Clinical Scenario

Used when testing for JE in patients with suspected infection.

Documentation Requirements

Document the reason for testing and clinical symptoms.

Specialty Considerations

Infectious disease specialists should ensure comprehensive documentation of travel history.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of Japanese encephalitis, improving the ability to track and manage cases of this disease. It emphasizes the importance of detailed documentation regarding vaccination and travel history.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of Japanese encephalitis, improving the ability to track and manage cases of this disease. It emphasizes the importance of detailed documentation regarding vaccination and travel history.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of Japanese encephalitis, improving the ability to track and manage cases of this disease. It emphasizes the importance of detailed documentation regarding vaccination and travel history.

Resources

Clinical References

  • •
    CDC Japanese Encephalitis Information

Coding & Billing References

  • •
    CDC Japanese Encephalitis Information

Frequently Asked Questions

What is the primary mode of transmission for Japanese encephalitis?

Japanese encephalitis is primarily transmitted through the bite of infected mosquitoes, particularly in rural areas where the virus is endemic.

How can Japanese encephalitis be prevented?

Vaccination is the most effective way to prevent Japanese encephalitis, especially for individuals traveling to endemic regions. Additionally, using mosquito repellent and protective clothing can help reduce the risk of infection.