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ICD-10 Guide
ICD-10 CodesA48.4

A48.4

Bartonellosis

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

Code Description

ICD-10 A48.4 is a billable code used to indicate a diagnosis of bartonellosis.

Key Diagnostic Point:

Bartonellosis is an infectious disease caused by bacteria of the genus Bartonella, which includes several species that can infect humans. The most notable species associated with human disease are Bartonella henselae, which causes cat scratch fever, and Bartonella bacilliformis, which is responsible for Carrion's disease. In immunocompromised patients, such as those with HIV/AIDS or those undergoing immunosuppressive therapy, Bartonellosis can manifest as opportunistic infections, leading to severe complications. Symptoms may include fever, lymphadenopathy, and in some cases, more severe manifestations like endocarditis or bacillary angiomatosis. The diagnosis of Bartonellosis can be challenging due to its nonspecific symptoms and the need for serological or molecular testing to confirm the presence of the bacteria. Clinicians must maintain a high index of suspicion, especially in patients with risk factors for opportunistic infections, to ensure timely diagnosis and treatment.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of clinical presentations depending on the species involved.
  • Need for specific laboratory tests for accurate diagnosis.
  • Potential overlap with other infectious diseases.
  • Documentation of immunocompromised status is crucial.

Audit Risk Factors

  • Inadequate documentation of immunocompromised status.
  • Failure to document specific laboratory tests performed.
  • Misclassification of the type of Bartonella infection.
  • Lack of clear clinical correlation between symptoms and diagnosis.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

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

Common Clinical Scenarios

Patients presenting with fever and lymphadenopathy, especially those with a history of cat exposure.

Billing Considerations

Ensure documentation reflects the immunocompromised status and any opportunistic infections.

Primary Care

Documentation Requirements

Comprehensive patient history, including exposure history and symptomatology.

Common Clinical Scenarios

Patients with unexplained fever or lymphadenopathy, particularly in endemic areas.

Billing Considerations

Consider referral to infectious disease specialists for complex cases.

Coding Guidelines

Inclusion Criteria

Use A48.4 When
  • According to ICD
  • 10 guidelines, A48
  • 4 should be used when there is a confirmed diagnosis of Bartonellosis
  • Documentation must support the diagnosis, including laboratory confirmation and clinical symptoms

Exclusion Criteria

Do NOT use A48.4 When
  • Exclusion criteria include other specified infections that may mimic Bartonellosis

Related CPT Codes

86701CPT Code

Antibody test for Bartonella species

Clinical Scenario

Used when Bartonellosis is suspected based on clinical presentation.

Documentation Requirements

Document the reason for testing and clinical findings.

Specialty Considerations

Infectious disease specialists may require additional tests for confirmation.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of Bartonellosis, improving the ability to track and manage this opportunistic infection in immunocompromised patients.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of Bartonellosis, improving the ability to track and manage this opportunistic infection in immunocompromised patients.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of Bartonellosis, improving the ability to track and manage this opportunistic infection in immunocompromised patients.

Resources

Clinical References

  • •
    CDC Bartonella Information

Coding & Billing References

  • •
    CDC Bartonella Information

Frequently Asked Questions

What are the common symptoms of Bartonellosis?

Common symptoms include fever, lymphadenopathy, and in some cases, skin lesions or endocarditis, particularly in immunocompromised patients.