| ICD-10 Code | Description |
| O30.101 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimester |
| O30.102 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimester |
| O30.103 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimester |
| O30.109 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester |
| O30.111 | Triplet pregnancy with two or more monochorionic fetuses, first trimester |
| O30.112 | Triplet pregnancy with two or more monochorionic fetuses, second trimester |
| O30.113 | Triplet pregnancy with two or more monochorionic fetuses, third trimester |
| O30.119 | Triplet pregnancy with two or more monochorionic fetuses, unspecified trimester |
| O30.121 | Triplet pregnancy with two or more monoamniotic fetuses, first trimester |
| O30.122 | Triplet pregnancy with two or more monoamniotic fetuses, second trimester |
| O30.123 | Triplet pregnancy with two or more monoamniotic fetuses, third trimester |
| O30.129 | Triplet pregnancy with two or more monoamniotic fetuses, unspecified trimester |
| O30.131 | Triplet pregnancy, trichorionic/triamniotic, first trimester |
| O30.132 | Triplet pregnancy, trichorionic/triamniotic, second trimester |
| O30.133 | Triplet pregnancy, trichorionic/triamniotic, third trimester |
| O30.139 | Triplet pregnancy, trichorionic/triamniotic, unspecified trimester |
| O30.191 | Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, first trimester |
| O30.192 | Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, second trimester |
| O30.193 | Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, third trimester |
| O30.199 | Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, unspecified trimester |
