ICD-9-CM diagnosis code (retired)
979.0 — Poisoning by smallpox vaccine
About ICD-9-CM 979.0
979.0 is an ICD-9-CM diagnosis code for poisoning by smallpox vaccine. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to 4 ICD-10-CM codes, such as T50.B11A (Poisoning by smallpox vaccines, accidental (unintentional), initial encounter), T50.B12A (Poisoning by smallpox vaccines, intentional self-harm, initial encounter) and T50.B13A (Poisoning by smallpox vaccines, assault, initial encounter). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- T50.B11APoisoning by smallpox vaccines, accidental (unintentional), initial encounterapproximate
- T50.B12APoisoning by smallpox vaccines, intentional self-harm, initial encounterapproximate
- T50.B13APoisoning by smallpox vaccines, assault, initial encounterapproximate
- T50.B14APoisoning by smallpox vaccines, undetermined, initial encounterapproximate
Common questions about 979.0
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.