ICD-9 Code 745.5 - Ostium secundum type atrial septal defect

ICD-9-CM Diagnosis Code 745.5

Diagnosis Code: 745.5 (Raw: 7455)

Description: Ostium secundum type atrial septal defect

Classification: International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)

Fiscal Year: 2026 Reference

CMS Section 111 Status: Valid for reporting.

Overview & Historical Usage

ICD-9-CM code 745.5 is designated for Ostium secundum type atrial septal defect. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical clinical data analysis.