CYP2C9*47 is assigned uncertain function due to inadequate evidence. In vitro studies found CYP2C9*47 demonstrated enzyme activity ranging from decreased to increased compared to wildtype with various substrates (24077631, 24118918, 25142737, 25144335, 25476996, 25832633, 25884291, 25924705, 25951663, 27163851, 23844998). Therefore, consensus among experts was uncertain function due to inadequate evidence.