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ICD-10 Guide
ICD-10 CodesA77.9

A77.9

Dengue fever, unspecified

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

Code Description

ICD-10 A77.9 is a billable code used to indicate a diagnosis of dengue fever, unspecified.

Key Diagnostic Point:

Dengue fever is a viral illness transmitted primarily by Aedes mosquitoes, particularly Aedes aegypti and Aedes albopictus. It is characterized by high fever, severe headache, retro-orbital pain, myalgia, arthralgia, and rash. The disease can progress to severe dengue, which may lead to hemorrhagic manifestations and shock. The unspecified designation indicates that the specific type or severity of dengue fever has not been documented. Dengue fever is endemic in tropical and subtropical regions, and its incidence has increased dramatically in recent decades, making it a significant public health concern. The clinical presentation can vary widely, and laboratory confirmation is essential for diagnosis. Travel-related infections are common, as individuals visiting endemic areas may contract the virus. Vector control measures and public health interventions are crucial in managing outbreaks and preventing transmission.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of dengue fever.
  • Need for laboratory confirmation to differentiate from other febrile illnesses.
  • Potential for co-infection with other vector-borne diseases.
  • Documentation of travel history and exposure risk is critical.

Audit Risk Factors

  • Inadequate documentation of travel history.
  • Failure to specify the type of dengue fever.
  • Misclassification of dengue severity.
  • Lack of laboratory confirmation in the medical record.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed travel history, clinical symptoms, and laboratory results.

Common Clinical Scenarios

Patients presenting with fever and travel history to endemic areas.

Billing Considerations

Consideration of differential diagnoses such as chikungunya and Zika virus.

Emergency Medicine

Documentation Requirements

Comprehensive assessment of symptoms and potential complications.

Common Clinical Scenarios

Patients with acute febrile illness and recent travel.

Billing Considerations

Timely identification of severe dengue to initiate appropriate management.

Coding Guidelines

Inclusion Criteria

Use A77.9 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of symptoms, travel history, and laboratory results

Exclusion Criteria

Do NOT use A77.9 When
  • Exclude other febrile illnesses unless specified

Related CPT Codes

86790CPT Code

Dengue virus serology

Clinical Scenario

Used to confirm diagnosis in suspected cases.

Documentation Requirements

Document the reason for testing and clinical findings.

Specialty Considerations

Infectious disease specialists may require additional serological tests.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of dengue fever, improving data collection and public health response to outbreaks.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of dengue fever, improving data collection and public health response to outbreaks.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of dengue fever, improving data collection and public health response to outbreaks.

Resources

Clinical References

  • •
    CDC Dengue Information

Coding & Billing References

  • •
    CDC Dengue Information

Frequently Asked Questions

What is the difference between A77.9 and A77.0?

A77.9 is used for unspecified dengue fever, while A77.0 is specifically for dengue fever with hemorrhagic manifestations, which requires different clinical documentation.