| O31.8X | Other complications specific to multiple gestation | NON-BILLABLE CODE |
| O31.8X1 | Other complications specific to multiple gestation, first trimester | NON-BILLABLE CODE |
| O31.8X10 | Other complications specific to multiple gestation, first trimester, not applicable or unspecified | BILLABLE CODE |
| O31.8X11 | Other complications specific to multiple gestation, first trimester, fetus 1 | BILLABLE CODE |
| O31.8X12 | Other complications specific to multiple gestation, first trimester, fetus 2 | BILLABLE CODE |
| O31.8X13 | Other complications specific to multiple gestation, first trimester, fetus 3 | BILLABLE CODE |
| O31.8X14 | Other complications specific to multiple gestation, first trimester, fetus 4 | BILLABLE CODE |
| O31.8X15 | Other complications specific to multiple gestation, first trimester, fetus 5 | BILLABLE CODE |
| O31.8X19 | Other complications specific to multiple gestation, first trimester, other fetus | BILLABLE CODE |
| O31.8X2 | Other complications specific to multiple gestation, second trimester | NON-BILLABLE CODE |
| O31.8X20 | Other complications specific to multiple gestation, second trimester, not applicable or unspecified | BILLABLE CODE |
| O31.8X21 | Other complications specific to multiple gestation, second trimester, fetus 1 | BILLABLE CODE |
| O31.8X22 | Other complications specific to multiple gestation, second trimester, fetus 2 | BILLABLE CODE |
| O31.8X23 | Other complications specific to multiple gestation, second trimester, fetus 3 | BILLABLE CODE |
| O31.8X24 | Other complications specific to multiple gestation, second trimester, fetus 4 | BILLABLE CODE |
| O31.8X25 | Other complications specific to multiple gestation, second trimester, fetus 5 | BILLABLE CODE |
| O31.8X29 | Other complications specific to multiple gestation, second trimester, other fetus | BILLABLE CODE |
| O31.8X3 | Other complications specific to multiple gestation, third trimester | NON-BILLABLE CODE |
| O31.8X30 | Other complications specific to multiple gestation, third trimester, not applicable or unspecified | BILLABLE CODE |
| O31.8X31 | Other complications specific to multiple gestation, third trimester, fetus 1 | BILLABLE CODE |
| O31.8X32 | Other complications specific to multiple gestation, third trimester, fetus 2 | BILLABLE CODE |
| O31.8X33 | Other complications specific to multiple gestation, third trimester, fetus 3 | BILLABLE CODE |
| O31.8X34 | Other complications specific to multiple gestation, third trimester, fetus 4 | BILLABLE CODE |
| O31.8X35 | Other complications specific to multiple gestation, third trimester, fetus 5 | BILLABLE CODE |
| O31.8X39 | Other complications specific to multiple gestation, third trimester, other fetus | BILLABLE CODE |
| O31.8X9 | Other complications specific to multiple gestation, unspecified trimester | NON-BILLABLE CODE |
| O31.8X90 | Other complications specific to multiple gestation, unspecified trimester, not applicable or unspecified | BILLABLE CODE |
| O31.8X91 | Other complications specific to multiple gestation, unspecified trimester, fetus 1 | BILLABLE CODE |
| O31.8X92 | Other complications specific to multiple gestation, unspecified trimester, fetus 2 | BILLABLE CODE |
| O31.8X93 | Other complications specific to multiple gestation, unspecified trimester, fetus 3 | BILLABLE CODE |
| O31.8X94 | Other complications specific to multiple gestation, unspecified trimester, fetus 4 | BILLABLE CODE |
| O31.8X95 | Other complications specific to multiple gestation, unspecified trimester, fetus 5 | BILLABLE CODE |
| O31.8X99 | Other complications specific to multiple gestation, unspecified trimester, other fetus | BILLABLE CODE |
