O30.8 - Other specified multiple gestation
O30.81 - Other specified multiple gestation with two or more monochorionic fetuses
O30.811 - Other specified multiple gestation with two or more monochorionic fetuses, first trimester
O30.812 - Other specified multiple gestation with two or more monochorionic fetuses, second trimester
O30.813 - Other specified multiple gestation with two or more monochorionic fetuses, third trimester
O30.819 - Other specified multiple gestation with two or more monochorionic fetuses, unspecified trimester