ICD-9-CM diagnosis code (retired)
979.9 — Poisoning by other and unspecified vaccines and biological substances
About ICD-9-CM 979.9
979.9 is an ICD-9-CM diagnosis code for poisoning by other and unspecified vaccines and biological substances. 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 9 ICD-10-CM codes, such as T50.901A (Poisoning by unspecified drugs, medicaments and biological substances, accidental (unintentional), initial encounter), T50.991A (Poisoning by other drugs, medicaments and biological substances, accidental (unintentional), initial encounter) and T50.992A (Poisoning by other drugs, medicaments and biological substances, intentional self-harm, initial encounter). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- T50.901APoisoning by unspecified drugs, medicaments and biological substances, accidental (unintentional), initial encounterapproximate
- T50.991APoisoning by other drugs, medicaments and biological substances, accidental (unintentional), initial encounterapproximate
- T50.992APoisoning by other drugs, medicaments and biological substances, intentional self-harm, initial encounterapproximate
- T50.993APoisoning by other drugs, medicaments and biological substances, assault, initial encounterapproximate
- T50.994APoisoning by other drugs, medicaments and biological substances, undetermined, initial encounterapproximate
- T50.Z91APoisoning by other vaccines and biological substances, accidental (unintentional), initial encounterapproximate
- T50.Z92APoisoning by other vaccines and biological substances, intentional self-harm, initial encounterapproximate
- T50.Z93APoisoning by other vaccines and biological substances, assault, initial encounterapproximate
- T50.Z94APoisoning by other vaccines and biological substances, undetermined, initial encounterapproximate
Common questions about 979.9
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.