ICD-9-CM diagnosis code (retired)
863.21 — Injury to duodenum, without open wound into cavity
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 863.21
863.21 is an ICD-9-CM diagnosis code for injury to duodenum, without open wound into cavity. 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, S36.400A (Unspecified injury of duodenum, initial encounter). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- S36.400AUnspecified injury of duodenum, initial encounterapproximate
Common questions about 863.21
What is the ICD-10 code for ICD-9 863.21?
- The GEMs map 863.21 to ICD-10-CM S36.400A.
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.