ICD-10 Diagnosis Code B03


Diagnosis Code B03

ICD-10: B03
Short Description: Smallpox
Long Description: Smallpox
This is the 2018 version of the ICD-10-CM diagnosis code B03

Valid for Submission
The code B03 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Certain infectious and parasitic diseases (A00–B99)
    • Viral infections characterized by skin and mucous membrane lesions (B00-B09)
      • Smallpox (B03)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code B03 is grouped in the following Diagnostic Related Group(s) (MS-DRG V34.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Alastrim
  • Flat-type smallpox
  • Hemorrhagic smallpox
  • Modified smallpox
  • Smallpox
  • Smallpox without rash
  • Variola major

Index of Diseases and Injuries
References found for the code B03 in the Index of Diseases and Injuries:

    • Notes:
      • In 1980 the 33rd World Health Assembly declared that smallpox had been eradicated.
      • The classification is maintained for surveillance purposes.

Information for Patients


Smallpox is a disease caused by the Variola major virus. Some experts say that over the centuries it has killed more people than all other infectious diseases combined. Worldwide immunization stopped the spread of smallpox three decades ago. The last case was reported in 1977. Two research labs still keep small amounts of the virus. Experts fear bioterrorists could use the virus to spread disease.

Smallpox spreads very easily from person to person. Symptoms are flu-like. They include

  • High fever
  • Fatigue
  • Headache
  • Backache
  • A rash with flat red sores

There is no treatment. Fluids and medicines for pain or fever can help control symptoms. Most people recover, but some can die. Those who do recover may have severe scars.

The U.S. stopped routine smallpox vaccinations in 1972. Military and other high-risk groups continue to get the vaccine. The U.S. has increased its supply of the vaccine in recent years. The vaccine makes some people sick, so doctors save it for those at highest risk of disease.

NIH: National Institute of Allergy and Infectious Diseases

  • Smallpox (Medical Encyclopedia)

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