ICD-9-CM diagnosis code (retired)
812.21 — Closed fracture of shaft of humerus
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 812.21
812.21 is an ICD-9-CM diagnosis code for closed fracture of shaft of humerus. 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, S42.399A (Other fracture of shaft of unspecified humerus, initial encounter for closed fracture). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- S42.399AOther fracture of shaft of unspecified humerus, initial encounter for closed fractureapproximate
Common questions about 812.21
What is the ICD-10 code for ICD-9 812.21?
- The GEMs map 812.21 to ICD-10-CM S42.399A.
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.