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ICD-10 Guide
ICD-10 CodesA79.82

A79.82

Anaplasmosis [A. phagocytophilum]

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

Code Description

ICD-10 A79.82 is a billable code used to indicate a diagnosis of anaplasmosis [a. phagocytophilum].

Key Diagnostic Point:

Anaplasmosis is a tick-borne infectious disease caused by the bacterium Anaplasma phagocytophilum, primarily transmitted through the bite of infected Ixodes ticks, commonly known as deer ticks. The disease is characterized by symptoms such as fever, chills, headache, muscle aches, and malaise, which typically appear within 1 to 2 weeks after the tick bite. Severe cases can lead to complications such as respiratory failure, renal failure, or even death, particularly in immunocompromised individuals. Diagnosis is often confirmed through serological testing or PCR assays that detect the presence of the bacteria in the blood. Anaplasmosis is prevalent in certain geographic regions, particularly in the northeastern and north-central United States, and is considered a significant public health concern due to its increasing incidence. The condition is part of a broader category of rickettsial diseases, which are also vector-borne and can present with overlapping symptoms, making accurate diagnosis and coding essential for effective treatment and epidemiological tracking.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiation from other tick-borne diseases such as Lyme disease and ehrlichiosis.
  • Need for accurate serological or PCR testing documentation.
  • Geographic prevalence affecting diagnosis and coding.
  • Potential for co-infection with other vector-borne pathogens.

Audit Risk Factors

  • Inadequate documentation of tick exposure.
  • Failure to document laboratory confirmation of diagnosis.
  • Misdiagnosis due to symptom overlap with other conditions.
  • Lack of detailed clinical history in cases of severe symptoms.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed clinical notes including symptom onset, exposure history, and laboratory results.

Common Clinical Scenarios

Patients presenting with fever and recent outdoor activities in endemic areas.

Billing Considerations

Consideration of co-infections and comprehensive testing for accurate diagnosis.

Primary Care

Documentation Requirements

Thorough patient history and physical examination findings.

Common Clinical Scenarios

Patients with flu-like symptoms and potential tick exposure.

Billing Considerations

Awareness of local epidemiology and timely referral to specialists if needed.

Coding Guidelines

Inclusion Criteria

Use A79.82 When
  • According to ICD
  • 10 coding guidelines, A79
  • 82 should be used when the diagnosis of anaplasmosis is confirmed through appropriate laboratory testing
  • It is important to document the clinical presentation and any relevant travel history, as this can impact the coding and billing process

Exclusion Criteria

Do NOT use A79.82 When
No specific exclusions found.

Related CPT Codes

87491CPT Code

Infectious agent detection by nucleic acid (DNA or RNA); Anaplasma phagocytophilum

Clinical Scenario

Used when laboratory testing confirms anaplasmosis.

Documentation Requirements

Laboratory results must be documented in the patient's medical record.

Specialty Considerations

Infectious disease specialists should ensure comprehensive testing is performed.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of anaplasmosis, improving the accuracy of epidemiological data and facilitating better tracking of disease incidence and treatment outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of anaplasmosis, improving the accuracy of epidemiological data and facilitating better tracking of disease incidence and treatment outcomes.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of anaplasmosis, improving the accuracy of epidemiological data and facilitating better tracking of disease incidence and treatment outcomes.

Resources

Clinical References

  • •
    Centers for Disease Control and Prevention (CDC) - Anaplasmosis

Coding & Billing References

  • •
    Centers for Disease Control and Prevention (CDC) - Anaplasmosis

Frequently Asked Questions

What are the common symptoms of anaplasmosis?

Common symptoms include fever, chills, headache, muscle aches, and malaise, which typically appear 1-2 weeks after a tick bite.

How is anaplasmosis diagnosed?

Diagnosis is confirmed through serological testing or PCR assays that detect A. phagocytophilum in the blood.

What is the treatment for anaplasmosis?

The first-line treatment for anaplasmosis is doxycycline, which is effective if administered early in the course of the disease.