Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes. A condition in which the foramen ovale in the atrial septum fails to close shortly after birth.Patent foramen ovale. Q2113, CC, 54 codes, Coronary sinus atrial septal defect. Q2113, Coronary sinus atrial septal defect. This document addresses the transcatheter closure of patent foramen ovale and transcatheter or open left atrial appendage (LAA) closure. A quarter of adults have an undiagnosed PFO, which can be problematic! This article covers 2023 PFO coding for excellent cardiology reimbursement! One way to treat an atrial septal defect is to use a catheter. Patent foramen ovale. Q21.19.