ICD-10-CM · Chapter 1 · A00-B99
B03 Smallpox
Notes
- In 1980 the 33rd World Health Assembly declared that smallpox had been eradicated.
- The classification is maintained for surveillance purposes.
This category is a complete, billable diagnosis code.
No additional specificity is required — submit B03 directly on claims and documentation without a subcode extension.
Last reviewed: September 2026