ICD-9-CM diagnosis code (retired)
977.4 — Poisoning by pharmaceutical excipients
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 977.4
977.4 is an ICD-9-CM diagnosis code for poisoning by pharmaceutical excipients. 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 one ICD-10-CM code, T50.991A (Poisoning by other drugs, medicaments and biological substances, accidental (unintentional), initial encounter). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- T50.991APoisoning by other drugs, medicaments and biological substances, accidental (unintentional), initial encounterapproximate
Common questions about 977.4
What is the ICD-10 code for ICD-9 977.4?
- The GEMs map 977.4 to ICD-10-CM T50.991A.
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.