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v1.0.0
ICD-10 Guide
ICD-10 CodesA81

A81

Rabies

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

Code Description

ICD-10 A81 is a billable code used to indicate a diagnosis of rabies.

Key Diagnostic Point:

Rabies is a viral infection caused by the rabies virus, which is a member of the Lyssavirus genus. It primarily affects the central nervous system (CNS) and is transmitted through the saliva of infected animals, most commonly via bites. The incubation period can vary from weeks to months, depending on the site of entry and the viral load. Initial symptoms may include fever, headache, and malaise, which can progress to neurological complications such as confusion, agitation, hallucinations, and paralysis. As the disease advances, patients may experience hydrophobia, aerophobia, and ultimately, coma and death if not treated promptly. Vaccination against rabies is crucial for individuals at high risk, such as veterinarians and animal handlers, and post-exposure prophylaxis (PEP) is effective if administered before the onset of symptoms. Accurate coding of rabies requires careful consideration of the patient's vaccination status, exposure history, and clinical manifestations to ensure appropriate management and reimbursement.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Varied clinical presentation and progression of the disease.
  • Need for accurate documentation of exposure history.
  • Differentiation from other viral CNS infections.
  • Consideration of vaccination status and post-exposure prophylaxis.

Audit Risk Factors

  • Inadequate documentation of exposure history.
  • Failure to note vaccination status.
  • Misclassification of rabies as another CNS infection.
  • Lack of detailed clinical notes on neurological symptoms.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history including exposure and vaccination status.

Common Clinical Scenarios

Patients presenting with neurological symptoms after animal bites.

Billing Considerations

Ensure thorough documentation of clinical progression and treatment response.

Emergency Medicine

Documentation Requirements

Immediate assessment of exposure risk and vaccination history.

Common Clinical Scenarios

Patients with acute neurological symptoms following potential rabies exposure.

Billing Considerations

Timely documentation is critical for initiating post-exposure prophylaxis.

Coding Guidelines

Inclusion Criteria

Use A81 When
  • Follow official ICD
  • 10 coding guidelines, ensuring accurate documentation of exposure history, vaccination status, and clinical symptoms
  • Include any relevant laboratory findings that support the diagnosis

Exclusion Criteria

Do NOT use A81 When
No specific exclusions found.

Related Codes

Child Codes

12 codes
A81.0
Rabies virus encephalitis
A81.00
Creutzfeldt-Jakob disease, unspecified
A81.01
Variant Creutzfeldt-Jakob disease
A81.09
Other Creutzfeldt-Jakob disease
A81.1
Rabies virus encephalitis
A81.2
Rabies virus encephalitis
A81.8
Other viral encephalitis, not elsewhere classified
A81.81
Kuru
A81.82
Gerstmann-Sträussler-Scheinker syndrome
A81.83
Fatal familial insomnia
A81.89
Other atypical virus infections of central nervous system
A81.9
Atypical virus infection of central nervous system, unspecified

Related CPT Codes

90675CPT Code

Rabies vaccine, intramuscular

Clinical Scenario

Administered post-exposure after potential rabies exposure.

Documentation Requirements

Document the reason for vaccination and patient history.

Specialty Considerations

Infectious disease specialists should ensure vaccination records are complete.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of rabies, improving the ability to track cases and manage public health responses effectively.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of rabies, improving the ability to track cases and manage public health responses effectively.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of rabies, improving the ability to track cases and manage public health responses effectively.

Resources

Clinical References

  • •
    CDC Rabies Information

Coding & Billing References

  • •
    CDC Rabies Information

Frequently Asked Questions

What documentation is required for coding rabies?

Documentation must include the patient's exposure history, vaccination status, and a detailed account of clinical symptoms and progression.