O30 - Multiple gestation
O30.0 - Twin pregnancy
O30.00 - Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs
O30.001 - Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimester
O30.002 - Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimester
O30.003 - Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimester
O30.009 - Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester
O30.01 - Twin pregnancy, monochorionic/monoamniotic
O30.011 - Twin pregnancy, monochorionic/monoamniotic, first trimester
O30.012 - Twin pregnancy, monochorionic/monoamniotic, second trimester
O30.013 - Twin pregnancy, monochorionic/monoamniotic, third trimester
O30.019 - Twin pregnancy, monochorionic/monoamniotic, unspecified trimester
O30.02 - Conjoined twin pregnancy
O30.021 - Conjoined twin pregnancy, first trimester
O30.022 - Conjoined twin pregnancy, second trimester
O30.023 - Conjoined twin pregnancy, third trimester
O30.029 - Conjoined twin pregnancy, unspecified trimester
O30.03 - Twin pregnancy, monochorionic/diamniotic
O30.031 - Twin pregnancy, monochorionic/diamniotic, first trimester
O30.032 - Twin pregnancy, monochorionic/diamniotic, second trimester
O30.033 - Twin pregnancy, monochorionic/diamniotic, third trimester
O30.039 - Twin pregnancy, monochorionic/diamniotic, unspecified trimester
O30.04 - Twin pregnancy, dichorionic/diamniotic
O30.041 - Twin pregnancy, dichorionic/diamniotic, first trimester
O30.042 - Twin pregnancy, dichorionic/diamniotic, second trimester
O30.043 - Twin pregnancy, dichorionic/diamniotic, third trimester
O30.049 - Twin pregnancy, dichorionic/diamniotic, unspecified trimester
O30.09 - Twin pregnancy, unable to determine number of placenta and number of amniotic sacs
O30.091 - Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, first trimester
O30.092 - Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, second trimester
O30.093 - Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, third trimester
O30.099 - Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, unspecified trimester