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. A condition in which the foramen ovale in the atrial septum fails to close shortly after birth. Explore essential ICD-10 codes for Patent Foramen Ovale (PFO) diagnosis—accurate coding for PFO-related conditions in healthcare documentation and billing. ICD-10 Codes for the Identification of Fatal CHD. The investigational leadless pacemaker, when implanted with a subcutaneous ICD, delivers antitachycardia and bradycardia pacing (Fig. If a cohort case is CEL eligible only on the basis of a ICD9 code 438, or ICD10 code I69. Foramen Ovale (PFO) Closures.