O30.8 - Other specified multiple gestation
O30.82 - Other specified multiple gestation with two or more monoamniotic fetuses
O30.821 - Other specified multiple gestation with two or more monoamniotic fetuses, first trimester
O30.822 - Other specified multiple gestation with two or more monoamniotic fetuses, second trimester
O30.823 - Other specified multiple gestation with two or more monoamniotic fetuses, third trimester
O30.829 - Other specified multiple gestation with two or more monoamniotic fetuses, unspecified trimester