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ICD-10 Guide
ICD-10 CodesA24.0

A24.0

Rat-bite fever (Streptobacillus moniliformis infection)

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

Code Description

ICD-10 A24.0 is a billable code used to indicate a diagnosis of rat-bite fever (streptobacillus moniliformis infection).

Key Diagnostic Point:

Rat-bite fever is a zoonotic infection caused by the bacterium Streptobacillus moniliformis, primarily transmitted to humans through bites or scratches from infected rats or contact with their secretions. The disease can also be contracted through ingestion of contaminated food or water. Symptoms typically manifest 3 to 10 days after exposure and may include fever, chills, headache, muscle pain, and rash. In severe cases, it can lead to complications such as endocarditis or septic arthritis. Diagnosis is often made based on clinical presentation and confirmed through serological tests or culture of the organism. Prompt treatment with antibiotics, such as penicillin or doxycycline, is crucial to prevent serious complications. Public health measures focus on rodent control and education to minimize exposure risks, particularly in urban areas where rat populations are prevalent.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between rat-bite fever and other zoonotic infections.
  • Understanding the various transmission routes and their implications for coding.
  • Recognizing the need for specific documentation of exposure history.
  • Navigating the potential for co-infections with other pathogens.

Audit Risk Factors

  • Inadequate documentation of exposure history.
  • Failure to specify the type of transmission (bite vs. contact).
  • Misdiagnosis or coding of similar zoonotic infections.
  • Lack of supporting lab results for diagnosis.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history including exposure to rodents, symptom onset, and laboratory results.

Common Clinical Scenarios

Patients presenting with fever and a history of rodent exposure.

Billing Considerations

Ensure all relevant lab tests are documented to support the diagnosis.

Primary Care

Documentation Requirements

Comprehensive patient history and physical examination findings.

Common Clinical Scenarios

Patients with flu-like symptoms and potential exposure to rats.

Billing Considerations

Document any preventive measures taken or recommended to the patient.

Coding Guidelines

Inclusion Criteria

Use A24.0 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of the patient's exposure history and clinical symptoms
  • Include any relevant laboratory findings that support the diagnosis of rat
  • bite fever

Exclusion Criteria

Do NOT use A24.0 When
No specific exclusions found.

Related CPT Codes

87070CPT Code

Culture, bacterial, any source

Clinical Scenario

Used when confirming the diagnosis of rat-bite fever.

Documentation Requirements

Document the source of the culture and clinical symptoms.

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 ability to track and manage this zoonotic infection in public health.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of rat-bite fever, improving the ability to track and manage this zoonotic infection in public health.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of rat-bite fever, improving the ability to track and manage this zoonotic infection in public health.

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 rash, typically appearing 3 to 10 days after exposure.

How is rat-bite fever diagnosed?

Diagnosis is based on clinical presentation and can be confirmed through serological tests or culture of Streptobacillus moniliformis.

What is the treatment for rat-bite fever?

Treatment typically involves antibiotics such as penicillin or doxycycline, and early intervention is crucial to prevent complications.