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ICD-10 Guide
ICD-10 CodesA69.20

A69.20

Lyme disease, unspecified

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

Code Description

ICD-10 A69.20 is a billable code used to indicate a diagnosis of lyme disease, unspecified.

Key Diagnostic Point:

Lyme disease is a tick-borne illness caused by the spirochete Borrelia burgdorferi, primarily transmitted to humans through the bite of infected Ixodes ticks. The disease is characterized by a range of symptoms that can vary widely among individuals. Early signs often include erythema migrans, a distinctive rash that appears at the site of the tick bite, along with flu-like symptoms such as fever, chills, fatigue, and muscle aches. If left untreated, Lyme disease can progress to more severe manifestations, including neurological complications (such as meningitis or Bell's palsy) and Lyme arthritis. The geographic distribution of Lyme disease is primarily in the northeastern, north-central, and Pacific coastal regions of the United States, with endemic areas including parts of Connecticut, New York, New Jersey, Wisconsin, and California. The complexity of diagnosing Lyme disease arises from its varied clinical presentations and the overlap with other conditions, necessitating careful clinical evaluation and often serological testing to confirm the diagnosis. As such, coding for Lyme disease can be nuanced, particularly when distinguishing between early localized, early disseminated, and late manifestations of the disease.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Varied clinical presentations and symptoms
  • Need for serological testing for confirmation
  • Differentiation from other tick-borne diseases
  • Geographic considerations for endemic areas

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to specify the stage of Lyme disease
  • Misdiagnosis or coding of co-infections
  • Lack of supporting lab results

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed clinical history, laboratory test results, and treatment plans.

Common Clinical Scenarios

Patients presenting with rash, flu-like symptoms, or joint pain after tick exposure.

Billing Considerations

Ensure documentation reflects the timeline of symptoms and any serological testing performed.

Primary Care

Documentation Requirements

Comprehensive patient history, including travel history and tick exposure.

Common Clinical Scenarios

Patients with unexplained fever or rash after outdoor activities in endemic areas.

Billing Considerations

Documenting the patient's risk factors and any preventive measures taken.

Coding Guidelines

Inclusion Criteria

Use A69.20 When
  • According to ICD
  • 10 guidelines, A69
  • 20 is used when Lyme disease is diagnosed but the specific manifestations are not documented
  • Coders should ensure that the diagnosis is supported by clinical findings and that any relevant tests are noted

Exclusion Criteria

Do NOT use A69.20 When
No specific exclusions found.

Related CPT Codes

87491CPT Code

Infectious agent detection by nucleic acid (DNA or RNA); Borrelia burgdorferi

Clinical Scenario

Used when testing for Lyme disease is performed.

Documentation Requirements

Document the reason for testing and any clinical findings.

Specialty Considerations

Infectious disease specialists should ensure comprehensive documentation of 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 Lyme disease, enabling better tracking of its manifestations and improving the accuracy of epidemiological data.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of Lyme disease, enabling better tracking of its manifestations and improving the accuracy of epidemiological data.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of Lyme disease, enabling better tracking of its manifestations and improving the accuracy of epidemiological data.

Resources

Clinical References

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

Coding & Billing References

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

Frequently Asked Questions

What are the common symptoms of Lyme disease?

Common symptoms include fever, chills, fatigue, muscle and joint aches, and swollen lymph nodes. A characteristic rash known as erythema migrans may also develop.

How is Lyme disease diagnosed?

Diagnosis is based on clinical evaluation, history of tick exposure, and serological testing for antibodies against Borrelia burgdorferi.

What is the treatment for Lyme disease?

Early Lyme disease is typically treated with antibiotics such as doxycycline or amoxicillin. Treatment duration may vary based on the stage of the disease.