O31.8X Other complications specific to multiple gestationNon-billable header with 4 child codes.
O31.8X1 Other complications specific to multiple gestation, first trimesterO31.8X2 Other complications specific to multiple gestation, second trimesterO31.8X3 Other complications specific to multiple gestation, third trimesterO31.8X9 Other complications specific to multiple gestation, unspecified trimesterO31.33X3 Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 3O31.33X4 Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 4O31.33X5 Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 5O31.33X9 Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, other fetusO31.8 Other complications specific to multiple gestationO31.8X Other complications specific to multiple gestation (this code)O31.8X1 Other complications specific to multiple gestation, first trimesterO31.8X10 Other complications specific to multiple gestation, first trimester, not applicable or unspecifiedO31.8X11 Other complications specific to multiple gestation, first trimester, fetus 1O31.8X12 Other complications specific to multiple gestation, first trimester, fetus 2O31.8X13 Other complications specific to multiple gestation, first trimester, fetus 3