Diagnosis Code


Code Information

Diagnosis Code: B03

Short Description: Smallpox

Long Description: Smallpox

The code B03 is VALID for claim submission

Code Classification:

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

Code Version: 2022 ICD-10-CM


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

Diagnostic Related Group(s)

The code B03 is grouped in the following Diagnostic Related Group(s) (MS-DRG v39.0)
  • Viral Illness With Mcc (865)
  • Viral Illness Without Mcc (866)

References to Index of Diseases and Injuries

The code B03 has the following ICD-10-CM references to 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.

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
B03 Right Arrow 050.0 Variola major
050.1 Alastrim
050.9 Smallpox NOS

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description

This page was last updated on: 10/1/2023