A condition in which the foramen ovale in the atrial septum fails to close shortly after birth. ICD-10-PCS procedure codes: Code Description. 02U53JZ.Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes. Patent foramen ovale. Q21.19. Other specified atrial septal defect. Use Q21.12 for Patent foramen ovale - BILLABLE CODE. ICD 10 code for Personal history of (corrected) congenital malformations of heart and circulatory system. ICD 10 code for Ventricular septal defect. Get free rules, notes, crosswalks, synonyms, history for ICD-10 code Q21.0. Patent foramen ovale. Q21.19.