ICD-9-CM diagnosis code (retired)
966.1 — Poisoning by hydantoin derivatives
About ICD-9-CM 966.1
966.1 is an ICD-9-CM diagnosis code for poisoning by hydantoin derivatives. 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 T42.0X1A (Poisoning by hydantoin derivatives, accidental (unintentional), initial encounter), T42.0X2A (Poisoning by hydantoin derivatives, intentional self-harm, initial encounter) and T42.0X3A (Poisoning by hydantoin derivatives, assault, initial encounter). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- T42.0X1APoisoning by hydantoin derivatives, accidental (unintentional), initial encounterapproximate
- T42.0X2APoisoning by hydantoin derivatives, intentional self-harm, initial encounterapproximate
- T42.0X3APoisoning by hydantoin derivatives, assault, initial encounterapproximate
- T42.0X4APoisoning by hydantoin derivatives, undetermined, initial encounterapproximate
Common questions about 966.1
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.