ICD-9-CM diagnosis code (retired)
978.9 — Poisoning by mixed bacterial vaccines, except combinations with a pertussis component
About ICD-9-CM 978.9
978.9 is an ICD-9-CM diagnosis code for poisoning by mixed bacterial vaccines, except combinations with a pertussis component. 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.A21A (Poisoning by mixed bacterial vaccines without a pertussis component, accidental (unintentional), initial encounter), T50.A22A (Poisoning by mixed bacterial vaccines without a pertussis component, intentional self-harm, initial encounter) and T50.A23A (Poisoning by mixed bacterial vaccines without a pertussis component, assault, initial encounter). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- T50.A21APoisoning by mixed bacterial vaccines without a pertussis component, accidental (unintentional), initial encounterapproximate
- T50.A22APoisoning by mixed bacterial vaccines without a pertussis component, intentional self-harm, initial encounterapproximate
- T50.A23APoisoning by mixed bacterial vaccines without a pertussis component, assault, initial encounterapproximate
- T50.A24APoisoning by mixed bacterial vaccines without a pertussis component, undetermined, initial encounterapproximate
Common questions about 978.9
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.