| O4212 | Full-term premature rupture of membranes, onset of labor more than 24 hours following rupture |
| O429 | Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor |
| O4290 | Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified weeks of gestation |
| O4291 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor |
| O42911 | Pretrm prem ROM, unsp time betw rupt and onset labr, 1st tri Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, first trimester |
| O42912 | Pretrm prem ROM, unsp time betw rupt and onset labr, 2nd tri Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, second trimester |
| O42913 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, third trimester |
| O42919 | Pretrm prem ROM, unsp time betw rupt and onst labr, unsp tri Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified trimester |
| O4292 | Full-term premature rupture of membranes, unspecified as to length of time between rupture and onset of labor |
| O43 | Placental disorders |
| O430 | Placental transfusion syndromes |
| O4301 | Fetomaternal placental transfusion syndrome |
| O43011 | Fetomaternal placental transfusion syndrome, first trimester Fetomaternal placental transfusion syndrome, first trimester |
| O43012 | Fetomaternal placental transfusion syndrome, second trimester |
| O43013 | Fetomaternal placental transfusion syndrome, third trimester Fetomaternal placental transfusion syndrome, third trimester |
| O43019 | Fetomaternal placental transfusion syndrome, unspecified trimester |
| O4302 | Fetus-to-fetus placental transfusion syndrome |
| O43021 | Fetus-to-fetus placental transfuse syndrome, first trimester Fetus-to-fetus placental transfusion syndrome, first trimester |
| O43022 | Fetus-to-fetus placental transfusion syndrome, second trimester |
| O43023 | Fetus-to-fetus placental transfuse syndrome, third trimester Fetus-to-fetus placental transfusion syndrome, third trimester |
| O43029 | Fetus-to-fetus placental transfusion syndrome, unspecified trimester |
| O431 | Malformation of placenta |
| O4310 | Malformation of placenta, unspecified |
| O43101 | Malformation of placenta, unspecified, first trimester |
| O43102 | Malformation of placenta, unspecified, second trimester |
| O43103 | Malformation of placenta, unspecified, third trimester |
| O43109 | Malformation of placenta, unspecified, unspecified trimester Malformation of placenta, unspecified, unspecified trimester |
| O4311 | Circumvallate placenta |
| O43111 | Circumvallate placenta, first trimester |
| O43112 | Circumvallate placenta, second trimester |
| O43113 | Circumvallate placenta, third trimester |
| O43119 | Circumvallate placenta, unspecified trimester |
| O4312 | Velamentous insertion of umbilical cord |
| O43121 | Velamentous insertion of umbilical cord, first trimester |
| O43122 | Velamentous insertion of umbilical cord, second trimester |
| O43123 | Velamentous insertion of umbilical cord, third trimester |
| O43129 | Velamentous insertion of umbilical cord, unspecified trimester |
| O4319 | Other malformation of placenta |
| O43191 | Other malformation of placenta, first trimester |
| O43192 | Other malformation of placenta, second trimester |
| O43193 | Other malformation of placenta, third trimester |
| O43199 | Other malformation of placenta, unspecified trimester |
| O432 | Morbidly adherent placenta |
| O4321 | Placenta accreta |
| O43211 | Placenta accreta, first trimester |
| O43212 | Placenta accreta, second trimester |
| O43213 | Placenta accreta, third trimester |
| O43219 | Placenta accreta, unspecified trimester |
| O4322 | Placenta increta |
| O43221 | Placenta increta, first trimester |