ICD-9-CM diagnosis code (retired)
909.5 — Late effect of adverse effect of drug, medicinal or biological substance
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 909.5
909.5 is an ICD-9-CM diagnosis code for late effect of adverse effect of drug, medicinal or biological substance. 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 2 ICD-10-CM codes, such as T50.905S (Adverse effect of unspecified drugs, medicaments and biological substances, sequela) and T88.7XXS (Unspecified adverse effect of drug or medicament, sequela). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 909.5
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.