B03

Billable

Smallpox

B03 is the ICD-10-CM code for Smallpox. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
A00-B99
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

What this means — in plain language

MedlinePlus · NIH

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 vaccination 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…

Read more about Smallpox at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Notes

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

Frequently asked questions

What is ICD-10 code B03?
B03 is the ICD-10-CM code for "Smallpox". It falls under A00-B99 Certain infectious and parasitic diseases.
Is B03 a billable code?
Yes — B03 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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