O43.1 - Malformation of placenta
O43.11 - Circumvallate placenta
O43.111 - Circumvallate placenta, first trimester
O43.112 - Circumvallate placenta, second trimester
O43.113 - Circumvallate placenta, third trimester
O43.119 - Circumvallate placenta, unspecified trimester