ICD-9-CM diagnosis code (retired)
746.9 — Unspecified congenital anomaly of heart
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 746.9
746.9 is an ICD-9-CM diagnosis code for unspecified congenital anomaly of heart. 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 Q20.9 (Congenital malformation of cardiac chambers and connections, unspecified) and Q24.9 (Congenital malformation of heart, unspecified). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 746.9
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.