Q21.10, Atrial septal defect, unspecified. Q21.11, Secundum atrial septal defect.Patent foramen ovale. Persistent foramen ovale. Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes. The terms included in a category of the Tabular List are not exhaustive; they serve as examples of the content of the category or as indicators of its extent. Implantable cardioverter-defibrillator. PFO. Patent Foramen Ovale (PFO). TTE. To ascertain the indication for closure, we identified ICD-. ICD-10-PCS procedure codes: Code Description. 02U53JZ.