Patent foramen ovale. Persistent foramen ovale.Q21.12 Patent foramen ovale - ICD-10-CM Diagnosis Codes. Updates to ICD-10-CM diagnosis codes related to Atrial Fibrillation were announced in the FY 2020 IPPS Final Rule and were effective as of October 1, 2019. Large congenital atrial septal defect (ASD) and patent foramen ovale (PFO). This document addresses the transcatheter closure of patent foramen ovale and transcatheter or open left atrial appendage (LAA) closure. Before proceeding, an inspection for patent foramen ovale (PFO) is performed. HDE = humanitarian device exemption; PFO = patent foramen ovale; PMA = premarket approval. 690.9) was defined has a pregnancy ending between the 6th and. 690.9) was defined has a pregnancy ending between the 6th and.