ICD-9-CM diagnosis code (retired)
121.9 — Trematode infection, unspecified
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 121.9
121.9 is an ICD-9-CM diagnosis code for trematode infection, unspecified. 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, B66.9 (Fluke infection, unspecified). The match is exact.
ICD-10-CM equivalents
- B66.9Fluke infection, unspecifiedexact match
Common questions about 121.9
What is the ICD-10 code for ICD-9 121.9?
- The GEMs map 121.9 to ICD-10-CM B66.9.
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.