ICD-9-CM diagnosis code (retired)
747.21 — Anomalies of aortic arch
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 747.21
747.21 is an ICD-9-CM diagnosis code for anomalies of aortic arch. 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 3 ICD-10-CM codes, such as Q25.45 (Double aortic arch), Q25.46 (Tortuous aortic arch) and Q25.47 (Right aortic arch). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 747.21
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.