O31 - Complications specific to multiple gestation
O31.2 - Continuing pregnancy after intrauterine death of one fetus or more
O31.20 - Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester
O31.21 - Continuing pregnancy after intrauterine death of one fetus or more, first trimester
O31.22 - Continuing pregnancy after intrauterine death of one fetus or more, second trimester
O31.23 - Continuing pregnancy after intrauterine death of one fetus or more, third trimester