--- O30.221 Quadruplet pregnancy with two or more monoamniotic fetuses, first trimester

--- O30.222 Quadruplet pregnancy with two or more monoamniotic fetuses, second trimester

--- O30.223 Quadruplet pregnancy with two or more monoamniotic fetuses, third trimester

--- O30.229 Quadruplet pregnancy with two or more monoamniotic fetuses, unspecified trimester