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ICD-10 Guide
ICD-10 CodesA25.0

A25.0

Rat bite fever, spirillary

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

Code Description

ICD-10 A25.0 is a billable code used to indicate a diagnosis of rat bite fever, spirillary.

Key Diagnostic Point:

Rat bite fever, spirillary is an infectious disease caused by the bacterium Spirillum minus, primarily transmitted through bites or scratches from infected rats. The disease is characterized by symptoms such as fever, chills, headache, and muscle pain, which typically appear 1-3 weeks after exposure. In some cases, a rash may develop, and complications can arise if left untreated, including septicemia and endocarditis. The disease is considered zoonotic, meaning it can be transmitted from animals to humans, and is most prevalent in areas with poor sanitation and high rodent populations. Public health measures focus on controlling rodent populations and educating communities about the risks associated with rat bites. Diagnosis is often made through clinical evaluation and serological testing, and treatment typically involves antibiotics. Awareness of this disease is crucial for healthcare providers, especially in endemic regions, to ensure timely diagnosis and management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Zoonotic nature requiring understanding of transmission vectors.
  • Potential for misdiagnosis with other febrile illnesses.
  • Need for specific documentation of exposure history.
  • Variability in clinical presentation among patients.

Audit Risk Factors

  • Inadequate documentation of exposure history.
  • Failure to specify the type of rat involved.
  • Misclassification of the disease as a different febrile illness.
  • Lack of supporting lab results in the medical record.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history including exposure to rodents, clinical symptoms, and laboratory test results.

Common Clinical Scenarios

Patients presenting with fever and a history of rodent exposure.

Billing Considerations

Consideration of differential diagnoses and the need for serological testing.

Primary Care

Documentation Requirements

Comprehensive patient history and physical examination findings.

Common Clinical Scenarios

Patients with unexplained fever and potential exposure to rats.

Billing Considerations

Awareness of local outbreaks and public health recommendations.

Coding Guidelines

Inclusion Criteria

Use A25.0 When
  • According to the official ICD
  • 10 coding guidelines, A25
  • 0 should be used when the clinical documentation supports a diagnosis of rat bite fever due to Spirillum minus
  • It is important to include details about the exposure and clinical symptoms

Exclusion Criteria

Do NOT use A25.0 When
  • Exclusion criteria include other febrile illnesses that may mimic the presentation

Related CPT Codes

87070CPT Code

Culture, bacterial, any source

Clinical Scenario

When a culture is performed to confirm the diagnosis of rat bite fever.

Documentation Requirements

Document the reason for the culture and the clinical findings.

Specialty Considerations

Infectious disease specialists may require additional lab tests.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of rat bite fever, improving the accuracy of epidemiological tracking and treatment outcomes. The detailed coding structure helps in better understanding the disease's impact on public health.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of rat bite fever, improving the accuracy of epidemiological tracking and treatment outcomes. The detailed coding structure helps in better understanding the disease's impact on public health.

Reimbursement & Billing Impact

reimbursement and to avoid audit issues.

Resources

Clinical References

  • •
    CDC - Rat-Bite Fever

Coding & Billing References

  • •
    CDC - Rat-Bite Fever

Frequently Asked Questions

What are the common symptoms of rat bite fever?

Common symptoms include fever, chills, headache, muscle pain, and sometimes a rash. Symptoms typically appear 1-3 weeks after exposure.