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. Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes. Patent foramen ovale. Q21.19. Other specified atrial septal defect. Rocio virus disease. A83.8. 02Q53ZZ Repair Atrial Septum, Percutaneous Approach. An atrial septal defect repair or closure device or a patent foramen ovale repair or closure device is present. Used for patent foramen ovale (PFO) which is a normal variant and for "ruleout" congenital heart disease (CHD).