ICD-9-CM diagnosis code (retired)
745.5 — Ostium secundum type atrial septal defect
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 745.5
745.5 is an ICD-9-CM diagnosis code for ostium secundum type atrial septal defect. 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, Q21.1 (Atrial septal defect). The match is exact.
ICD-10-CM equivalents
- Q21.1Atrial septal defectexact match
Common questions about 745.5
What is the ICD-10 code for ICD-9 745.5?
- The GEMs map 745.5 to ICD-10-CM Q21.1.
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.