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ICD-10 Guide
ICD-10 CodesA79.81

A79.81

Rickettsiosis due to Ehrlichia sennetsu

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

Code Description

ICD-10 A79.81 is a billable code used to indicate a diagnosis of rickettsiosis due to ehrlichia sennetsu.

Key Diagnostic Point:

Rickettsiosis due to Ehrlichia sennetsu is a rare infectious disease caused by the bacterium Ehrlichia sennetsu, which is transmitted primarily through the bite of infected ticks. This condition is characterized by a range of symptoms that may include fever, headache, malaise, and myalgia. In some cases, patients may also experience rash, lymphadenopathy, and gastrointestinal symptoms. The disease is particularly noted in certain geographic regions, especially in Southeast Asia, where the vector ticks are prevalent. Diagnosis is often challenging due to the nonspecific nature of the symptoms and the need for serological testing or PCR to confirm the presence of the pathogen. Treatment typically involves the use of tetracycline antibiotics, which are effective against the bacteria. Given the potential for severe complications, including multi-organ failure, timely diagnosis and treatment are crucial. Awareness of travel-related risks and vector-borne transmission is essential for prevention, especially for individuals traveling to endemic areas.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Limited awareness of the disease among healthcare providers.
  • Variability in symptom presentation complicating diagnosis.
  • Need for specific serological tests for confirmation.
  • Geographic specificity of the disease affecting coding accuracy.

Audit Risk Factors

  • Inadequate documentation of travel history.
  • Failure to document laboratory confirmation.
  • Misdiagnosis due to symptom overlap with other conditions.
  • Lack of specificity in coding related to geographic location.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed travel history, laboratory test results, and symptomatology.

Common Clinical Scenarios

Patients presenting with fever and rash after travel to endemic areas.

Billing Considerations

Ensure all relevant diagnostic tests are documented to support the use of A79.81.

Primary Care

Documentation Requirements

Comprehensive patient history including exposure risks and symptom timeline.

Common Clinical Scenarios

Patients with unexplained febrile illness returning from travel.

Billing Considerations

Consider differential diagnoses and document any relevant travel history.

Coding Guidelines

Inclusion Criteria

Use A79.81 When
  • According to ICD
  • 10 coding guidelines, A79
  • 81 should be used when there is confirmed rickettsiosis due to Ehrlichia sennetsu, supported by laboratory findings
  • It is important to document the travel history and symptomatology clearly to justify the use of this specific code

Exclusion Criteria

Do NOT use A79.81 When
No specific exclusions found.

Related CPT Codes

87491CPT Code

Infectious agent detection by nucleic acid (DNA or RNA); Ehrlichia sennetsu

Clinical Scenario

Used when laboratory confirmation of Ehrlichia sennetsu is required.

Documentation Requirements

Document the reason for testing and results.

Specialty Considerations

Infectious disease specialists should ensure accurate coding based on test results.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of rickettsial diseases, including A79.81, which enhances the ability to track and manage these infections more effectively.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of rickettsial diseases, including A79.81, which enhances the ability to track and manage these infections more effectively.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    CDC Rickettsial Diseases

Coding & Billing References

  • •
    CDC Rickettsial Diseases

Frequently Asked Questions

What are the common symptoms of rickettsiosis due to Ehrlichia sennetsu?

Common symptoms include fever, headache, malaise, myalgia, and in some cases, rash and lymphadenopathy.