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v1.0.0
ICD-10 Guide
ICD-10 CodesB03

B03

Smallpox

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

Code Description

ICD-10 B03 is a billable code used to indicate a diagnosis of smallpox.

Key Diagnostic Point:

Smallpox is a highly contagious and deadly viral infection caused by the variola virus. It is characterized by fever, body aches, and a distinctive rash that progresses to fluid-filled blisters and scabs. The disease is transmitted through respiratory droplets and direct contact with infected individuals or contaminated objects. Smallpox was declared eradicated in 1980 due to a successful global vaccination campaign led by the World Health Organization. The last natural outbreak occurred in 1977. Vaccination against smallpox is no longer routinely administered, but it is still considered for certain high-risk groups, such as laboratory personnel working with the variola virus or military personnel deployed to areas where smallpox could be used as a bioweapon. Complications from smallpox can include secondary bacterial infections, scarring, and in severe cases, death. The disease's eradication has made it a rare subject in modern medicine, but understanding its historical significance and the implications of potential bioterrorism remains crucial for public health preparedness.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Historical context of eradication complicates coding for current cases.
  • Limited documentation due to rarity of disease.
  • Potential for confusion with other viral exanthems.
  • Need for precise vaccination history in coding.

Audit Risk Factors

  • Inadequate documentation of vaccination status.
  • Misclassification with other viral infections.
  • Failure to document exposure history.
  • Lack of clarity in clinical presentation.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history, vaccination status, and clinical presentation.

Common Clinical Scenarios

Evaluation of patients with suspected smallpox exposure or vaccination history.

Billing Considerations

Ensure accurate documentation of exposure risk and vaccination history.

Public Health

Documentation Requirements

Surveillance data, outbreak investigation reports, and vaccination records.

Common Clinical Scenarios

Monitoring and managing potential bioterrorism threats involving smallpox.

Billing Considerations

Collaboration with epidemiologists for accurate reporting and coding.

Coding Guidelines

Inclusion Criteria

Use B03 When
  • Follow the official ICD
  • CM coding guidelines for infectious diseases, ensuring accurate documentation of clinical findings and vaccination history
  • Include any relevant exposure history and complications

Exclusion Criteria

Do NOT use B03 When
No specific exclusions found.

Related CPT Codes

90700CPT Code

Smallpox vaccine administration

Clinical Scenario

Administering the smallpox vaccine to at-risk individuals.

Documentation Requirements

Document patient consent, vaccination history, and any adverse reactions.

Specialty Considerations

Infectious disease specialists should ensure proper coding for vaccination.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of smallpox and its complications, improving data accuracy and public health reporting.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of smallpox and its complications, improving data accuracy and public health reporting.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of smallpox and its complications, improving data accuracy and public health reporting.

Resources

Clinical References

  • •
    World Health Organization - Smallpox

Coding & Billing References

  • •
    World Health Organization - Smallpox

Frequently Asked Questions

Is smallpox still a threat today?

While smallpox has been eradicated, it remains a concern for bioterrorism. Vaccination is recommended for certain high-risk groups.