ICD-10 Procedure Codes. ICD-10-PCS procedure codes: Code Description. 02U53JZ.Patent or persistent ostium secundum defect (type II). 745.5. Q21.12. (m) Patent foramen ovale. This document addresses the transcatheter closure of patent foramen ovale and transcatheter or open left atrial appendage (LAA) closure. Q21.10, Atrial septal defect, unspecified. Q21.11, Secundum atrial septal defect. This article contains coding and other guidelines that complement the local coverage determination (LCD) for Cardiac Catheterization and Coronary Angiography. Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes. Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes.