| O30003 | Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimester |
| O30009 | Twin pregnancy, unsp num plcnta & amnio sacs, unsp trimester Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester |
| O3001 | Twin pregnancy, monochorionic/monoamniotic |
| O30011 | Twin pregnancy, monochorionic/monoamniotic, first trimester |
| O30012 | Twin pregnancy, monochorionic/monoamniotic, second trimester Twin pregnancy, monochorionic/monoamniotic, second trimester |
| O30013 | Twin pregnancy, monochorionic/monoamniotic, third trimester |
| O30019 | Twin pregnancy, monochorionic/monoamniotic, unspecified trimester |
| O3002 | Conjoined twin pregnancy |
| O30021 | Conjoined twin pregnancy, first trimester |
| O30022 | Conjoined twin pregnancy, second trimester |
| O30023 | Conjoined twin pregnancy, third trimester |
| O30029 | Conjoined twin pregnancy, unspecified trimester |
| O3003 | Twin pregnancy, monochorionic/diamniotic |
| O30031 | Twin pregnancy, monochorionic/diamniotic, first trimester |
| O30032 | Twin pregnancy, monochorionic/diamniotic, second trimester |
| O30033 | Twin pregnancy, monochorionic/diamniotic, third trimester |
| O30039 | Twin pregnancy, monochorionic/diamniotic, unspecified trimester |
| O3004 | Twin pregnancy, dichorionic/diamniotic |
| O30041 | Twin pregnancy, dichorionic/diamniotic, first trimester |
| O30042 | Twin pregnancy, dichorionic/diamniotic, second trimester |
| O30043 | Twin pregnancy, dichorionic/diamniotic, third trimester |
| O30049 | Twin pregnancy, dichorionic/diamniotic, unspecified trimester |
| O3009 | Twin pregnancy, unable to determine number of placenta and number of amniotic sacs |
| O30091 | Twin preg, unable to dtrm num plcnta & amnio sacs, first tri Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, first trimester |
| O30092 | Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, second trimester |
| O30093 | Twin preg, unable to dtrm num plcnta & amnio sacs, third tri Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, third trimester |
| O30099 | Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, unspecified trimester |
| O301 | Triplet pregnancy |
| O3010 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs |
| O30101 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimester |
| O30102 | Triplet preg, unsp num plcnta & amnio sacs, second trimester Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimester |
| O30103 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimester |
| O30109 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester |
| O3011 | Triplet pregnancy with two or more monochorionic fetuses |
| O30111 | Triplet pregnancy with two or more monochorionic fetuses, first trimester |
| O30112 | Triplet preg w two or more monochorionic fetuses, second tri Triplet pregnancy with two or more monochorionic fetuses, second trimester |
| O30113 | Triplet pregnancy with two or more monochorionic fetuses, third trimester |
| O30119 | Triplet pregnancy with two or more monochorionic fetuses, unspecified trimester |
| O3012 | Triplet pregnancy with two or more monoamniotic fetuses |
| O30121 | Triplet pregnancy with two or more monoamniotic fetuses, first trimester |
| O30122 | Triplet pregnancy with two or more monoamniotic fetuses, second trimester |
| O30123 | Triplet pregnancy with two or more monoamniotic fetuses, third trimester |
| O30129 | Triplet preg w two or more monoamnio fetuses, unsp trimester Triplet pregnancy with two or more monoamniotic fetuses, unspecified trimester |
| O3013 | Triplet pregnancy, trichorionic/triamniotic |
| O30131 | Triplet pregnancy, trichorionic/triamniotic, first trimester Triplet pregnancy, trichorionic/triamniotic, first trimester |
| O30132 | Triplet pregnancy, trichorionic/triamniotic, second trimester |
| O30133 | Triplet pregnancy, trichorionic/triamniotic, third trimester Triplet pregnancy, trichorionic/triamniotic, third trimester |
| O30139 | Triplet pregnancy, trichorionic/triamniotic, unspecified trimester |
| O3019 | Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs |
| O30191 | Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, first trimester |