O30.0 Twin pregnancyNon-billable header with 6 child codes.
O30.00 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacsO30.01 Twin pregnancy, monochorionic/monoamnioticO30.02 Conjoined twin pregnancyO30.03 Twin pregnancy, monochorionic/diamnioticO30.04 Twin pregnancy, dichorionic/diamnioticO30.09 Twin pregnancy, unable to determine number of placenta and number of amniotic sacsO30 Multiple gestationO30.0 Twin pregnancy (this code)O30.00 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacsO30.001 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimesterO30.002 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimesterO30.003 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimesterO30.009 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester