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v1.0.0
ICD-10 Guide
ICD-10 CodesA49.9

A49.9

Bacterial infection, unspecified

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

Code Description

ICD-10 A49.9 is a billable code used to indicate a diagnosis of bacterial infection, unspecified.

Key Diagnostic Point:

A49.9 refers to an unspecified bacterial infection, which can encompass a wide range of infections caused by various bacteria. This code is often used when the specific type of bacterial infection cannot be determined or is not documented. In clinical practice, this code is particularly relevant for immunocompromised patients, such as those with HIV/AIDS, cancer, or those undergoing immunosuppressive therapy. These patients are at a higher risk for opportunistic infections, which may not present with classic symptoms, making diagnosis challenging. The lack of specificity in the code can lead to difficulties in treatment planning and epidemiological tracking. Clinicians must rely on clinical judgment, laboratory tests, and patient history to identify the underlying cause of the infection. The use of A49.9 may also indicate a need for further diagnostic workup to ascertain the specific pathogen involved, especially in cases where the patient presents with systemic symptoms without a clear source of infection.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Lack of specificity in the diagnosis
  • Variability in clinical presentation of infections
  • Need for comprehensive patient history and lab results
  • Potential for misdiagnosis or underdiagnosis

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to specify the type of bacterial infection
  • Inconsistent coding practices among providers
  • Lack of follow-up documentation on patient outcomes

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history, lab results, and clinical findings must be documented to support the diagnosis.

Common Clinical Scenarios

Patients presenting with fever, malaise, and no clear source of infection.

Billing Considerations

Consideration of opportunistic infections in immunocompromised patients is crucial for accurate coding.

Oncology

Documentation Requirements

Documentation of the patient's cancer treatment history and current immunocompromised status is essential.

Common Clinical Scenarios

Cancer patients presenting with infections during or after chemotherapy.

Billing Considerations

Understanding the patient's immune status is vital for determining the risk of opportunistic infections.

Coding Guidelines

Inclusion Criteria

Use A49.9 When
  • According to ICD
  • 10 coding guidelines, A49
  • 9 should be used when the specific bacterial infection is not documented
  • Coders should ensure that all relevant clinical information is captured to support the use of this code

Exclusion Criteria

Do NOT use A49.9 When
No specific exclusions found.

Related CPT Codes

87040CPT Code

Culture, bacterial, any source

Clinical Scenario

Used when a bacterial culture is performed to identify the pathogen.

Documentation Requirements

Document the source of the culture and clinical indications.

Specialty Considerations

Infectious disease specialists may require more detailed documentation.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more detailed coding, but A49.9 remains a catch-all for unspecified bacterial infections. This can lead to challenges in tracking infection trends and outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more detailed coding, but A49.9 remains a catch-all for unspecified bacterial infections. This can lead to challenges in tracking infection trends and outcomes.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more detailed coding, but A49.9 remains a catch-all for unspecified bacterial infections. This can lead to challenges in tracking infection trends and outcomes.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

When should A49.9 be used?

A49.9 should be used when a bacterial infection is suspected but not specifically identified. It is important to document the clinical context and any tests performed.