This document addresses the transcatheter closure of patent foramen ovale and transcatheter or open left atrial appendage (LAA) closure. Patent foramen ovale.Persistent foramen ovale. Q21.10, Atrial septal defect, unspecified. Q21.11, Secundum atrial septal defect. Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes. Used for patent foramen ovale (PFO) which is a normal variant and for "ruleout" congenital heart disease (CHD). The advanced conformable solution for patent foramen ovale (PFO) and ostium secundum atrial septal defect (ASD) closure. Patent Foramen Ovale (PFO). TTE. An atrial septal defect repair or closure device or a patent foramen ovale repair or closure device is present.