Patent foramen ovale. Persistent foramen ovale.Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes. Q2113, CC, 54 codes, Coronary sinus atrial septal defect. Large congenital atrial septal defect (ASD) and patent foramen ovale (PFO). A condition in which the foramen ovale in the atrial septum fails to close shortly after birth. ICD-10 Procedure Codes. ICD-10-PCS procedure codes: Code Description. 02U53JZ. Patent or persistent foramen ovale. Q21.11. Persistent left superior vena cava. Q26.1.