O43.0 - Placental transfusion syndromes
O43.02 - Fetus-to-fetus placental transfusion syndrome
O43.021 - Fetus-to-fetus placental transfusion syndrome, first trimester
O43.022 - Fetus-to-fetus placental transfusion syndrome, second trimester
O43.023 - Fetus-to-fetus placental transfusion syndrome, third trimester
O43.029 - Fetus-to-fetus placental transfusion syndrome, unspecified trimester