O31 - Complications specific to multiple gestation
O31.1 - Continuing pregnancy after spontaneous abortion of one fetus or more
O31.10 - Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester
O31.11 - Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester
O31.12 - Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester
O31.13 - Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester