has part has part has modifier Ventricular septal defect Tetralogy of Fallot ICD-10:Q21.3 A congenital cardiac malformation comprising pulmonary stenosis, overriding aorta, ventricular septum defect, and right ventricular hypertrophy. The diagnosis of TOF is made if at least three of the four above mentioned features are present. UMLS:C0039685 HP:0001636 Tetrology of fallot SNOMEDCT_US:86299006 Pulmonic stenosis Right ventricular hypertrophy Conotruncal defect Overriding aorta quality abnormal