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

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