| O40 | Polyhydramnios |
| O40.1 | Polyhydramnios, first trimester |
| O40.2 | Polyhydramnios, second trimester |
| O40.3 | Polyhydramnios, third trimester |
| O40.9 | Polyhydramnios, unspecified trimester |
| O41 | Other disorders of amniotic fluid and membranes |
| O41.0 | Oligohydramnios |
| O41.00 | Oligohydramnios, unspecified trimester |
| O41.01 | Oligohydramnios, first trimester |
| O41.02 | Oligohydramnios, second trimester |
| O41.03 | Oligohydramnios, third trimester |
| O41.1 | Infection of amniotic sac and membranes |
| O41.10 | Infection of amniotic sac and membranes, unspecified |
| O41.101 | Infection of amniotic sac and membranes, unspecified, first trimester |
| O41.102 | Infection of amniotic sac and membranes, unspecified, second trimester |
| O41.103 | Infection of amniotic sac and membranes, unspecified, third trimester |
| O41.109 | Infection of amniotic sac and membranes, unspecified, unspecified trimester |
| O41.12 | Chorioamnionitis |
| O41.121 | Chorioamnionitis, first trimester |
| O41.122 | Chorioamnionitis, second trimester |
| O41.123 | Chorioamnionitis, third trimester |
| O41.129 | Chorioamnionitis, unspecified trimester |
| O41.14 | Placentitis |
| O41.141 | Placentitis, first trimester |
| O41.142 | Placentitis, second trimester |
| O41.143 | Placentitis, third trimester |
| O41.149 | Placentitis, unspecified trimester |
| O41.8 | Other specified disorders of amniotic fluid and membranes |
| O41.9 | Disorder of amniotic fluid and membranes, unspecified |
| O41.90 | Disorder of amniotic fluid and membranes, unspecified, unspecified trimester |
| O41.91 | Disorder of amniotic fluid and membranes, unspecified, first trimester |
| O41.92 | Disorder of amniotic fluid and membranes, unspecified, second trimester |
| O41.93 | Disorder of amniotic fluid and membranes, unspecified, third trimester |
| O42 | Premature rupture of membranes |
| O42.0 | Premature rupture of membranes, onset of labor within 24 hours of rupture |
| O42.00 | Premature rupture of membranes, onset of labor within 24 hours of rupture, unspecified weeks of gestation |
| O42.01 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture |
| O42.011 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, first trimester |
| O42.012 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, second trimester |
| O42.013 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, third trimester |
| O42.019 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, unspecified trimester |
| O42.02 | Full-term premature rupture of membranes, onset of labor within 24 hours of rupture |
| O42.1 | Premature rupture of membranes, onset of labor more than 24 hours following rupture |
| O42.10 | Premature rupture of membranes, onset of labor more than 24 hours following rupture, unspecified weeks of gestation |
| O42.11 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture |
| O42.111 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, first trimester |
| O42.112 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, second trimester |
| O42.113 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, third trimester |
| O42.119 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, unspecified trimester |
| O42.12 | Full-term premature rupture of membranes, onset of labor more than 24 hours following rupture |
| O42.9 | Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor |
| O42.90 | Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified weeks of gestation |
| O42.91 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor |
| O42.911 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, first trimester |
| O42.912 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, second trimester |
| O42.913 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, third trimester |
| O42.919 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified trimester |
| O42.92 | Full-term premature rupture of membranes, unspecified as to length of time between rupture and onset of labor |
| O43 | Placental disorders |
| O43.0 | Placental transfusion syndromes |
| O43.01 | Fetomaternal placental transfusion syndrome |
| O43.011 | Fetomaternal placental transfusion syndrome, first trimester |
| O43.012 | Fetomaternal placental transfusion syndrome, second trimester |
| O43.013 | Fetomaternal placental transfusion syndrome, third trimester |
| O43.019 | Fetomaternal placental transfusion syndrome, unspecified trimester |
| 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 |
| O43.1 | Malformation of placenta |
| O43.10 | Malformation of placenta, unspecified |
| O43.101 | Malformation of placenta, unspecified, first trimester |
| O43.102 | Malformation of placenta, unspecified, second trimester |
| O43.103 | Malformation of placenta, unspecified, third trimester |
| O43.109 | Malformation of placenta, unspecified, unspecified trimester |
| O43.11 | Circumvallate placenta |
| O43.111 | Circumvallate placenta, first trimester |
| O43.112 | Circumvallate placenta, second trimester |
| O43.113 | Circumvallate placenta, third trimester |
| O43.119 | Circumvallate placenta, unspecified trimester |
| O43.12 | Velamentous insertion of umbilical cord |
| O43.121 | Velamentous insertion of umbilical cord, first trimester |
| O43.122 | Velamentous insertion of umbilical cord, second trimester |
| O43.123 | Velamentous insertion of umbilical cord, third trimester |
| O43.129 | Velamentous insertion of umbilical cord, unspecified trimester |
| O43.19 | Other malformation of placenta |
| O43.191 | Other malformation of placenta, first trimester |
| O43.192 | Other malformation of placenta, second trimester |
| O43.193 | Other malformation of placenta, third trimester |
| O43.199 | Other malformation of placenta, unspecified trimester |
| O43.2 | Morbidly adherent placenta |
| O43.21 | Placenta accreta |
| O43.211 | Placenta accreta, first trimester |
| O43.212 | Placenta accreta, second trimester |
| O43.213 | Placenta accreta, third trimester |
| O43.219 | Placenta accreta, unspecified trimester |
| O43.22 | Placenta increta |
| O43.221 | Placenta increta, first trimester |
| O43.222 | Placenta increta, second trimester |
| O43.223 | Placenta increta, third trimester |
| O43.229 | Placenta increta, unspecified trimester |
| O43.23 | Placenta percreta |
| O43.231 | Placenta percreta, first trimester |
| O43.232 | Placenta percreta, second trimester |
| O43.233 | Placenta percreta, third trimester |
| O43.239 | Placenta percreta, unspecified trimester |
| O43.8 | Other placental disorders |
| O43.81 | Placental infarction |
| O43.811 | Placental infarction, first trimester |
| O43.812 | Placental infarction, second trimester |
| O43.813 | Placental infarction, third trimester |
| O43.819 | Placental infarction, unspecified trimester |
| O43.89 | Other placental disorders |
| O43.891 | Other placental disorders, first trimester |
| O43.892 | Other placental disorders, second trimester |
| O43.893 | Other placental disorders, third trimester |
| O43.899 | Other placental disorders, unspecified trimester |
| O43.9 | Unspecified placental disorder |
| O43.90 | Unspecified placental disorder, unspecified trimester |
| O43.91 | Unspecified placental disorder, first trimester |
| O43.92 | Unspecified placental disorder, second trimester |
| O43.93 | Unspecified placental disorder, third trimester |
| O44 | Placenta previa |
| O44.0 | Complete placenta previa NOS or without hemorrhage |
| O44.00 | Complete placenta previa NOS or without hemorrhage, unspecified trimester |
| O44.01 | Complete placenta previa NOS or without hemorrhage, first trimester |
| O44.02 | Complete placenta previa NOS or without hemorrhage, second trimester |
| O44.03 | Complete placenta previa NOS or without hemorrhage, third trimester |
| O44.1 | Complete placenta previa with hemorrhage |
| O44.10 | Complete placenta previa with hemorrhage, unspecified trimester |
| O44.11 | Complete placenta previa with hemorrhage, first trimester |
| O44.12 | Complete placenta previa with hemorrhage, second trimester |
| O44.13 | Complete placenta previa with hemorrhage, third trimester |
| O44.2 | Partial placenta previa without hemorrhage |
| O44.20 | Partial placenta previa NOS or without hemorrhage, unspecified trimester |
| O44.21 | Partial placenta previa NOS or without hemorrhage, first trimester |
| O44.22 | Partial placenta previa NOS or without hemorrhage, second trimester |
| O44.23 | Partial placenta previa NOS or without hemorrhage, third trimester |
| O44.3 | Partial placenta previa with hemorrhage |
| O44.30 | Partial placenta previa with hemorrhage, unspecified trimester |
| O44.31 | Partial placenta previa with hemorrhage, first trimester |
| O44.32 | Partial placenta previa with hemorrhage, second trimester |
| O44.33 | Partial placenta previa with hemorrhage, third trimester |
| O44.4 | Low lying placenta NOS or without hemorrhage |
| O44.40 | Low lying placenta NOS or without hemorrhage, unspecified trimester |
| O44.41 | Low lying placenta NOS or without hemorrhage, first trimester |
| O44.42 | Low lying placenta NOS or without hemorrhage, second trimester |
| O44.43 | Low lying placenta NOS or without hemorrhage, third trimester |
| O44.5 | Low lying placenta with hemorrhage |
| O44.50 | Low lying placenta with hemorrhage, unspecified trimester |
| O44.51 | Low lying placenta with hemorrhage, first trimester |
| O44.52 | Low lying placenta with hemorrhage, second trimester |
| O44.53 | Low lying placenta with hemorrhage, third trimester |
| O45 | Premature separation of placenta [abruptio placentae] |
| O45.0 | Premature separation of placenta with coagulation defect |
| O45.00 | Premature separation of placenta with coagulation defect, unspecified |
| O45.001 | Premature separation of placenta with coagulation defect, unspecified, first trimester |
| O45.002 | Premature separation of placenta with coagulation defect, unspecified, second trimester |
| O45.003 | Premature separation of placenta with coagulation defect, unspecified, third trimester |
| O45.009 | Premature separation of placenta with coagulation defect, unspecified, unspecified trimester |
| O45.01 | Premature separation of placenta with afibrinogenemia |
| O45.011 | Premature separation of placenta with afibrinogenemia, first trimester |
| O45.012 | Premature separation of placenta with afibrinogenemia, second trimester |
| O45.013 | Premature separation of placenta with afibrinogenemia, third trimester |
| O45.019 | Premature separation of placenta with afibrinogenemia, unspecified trimester |
| O45.02 | Premature separation of placenta with disseminated intravascular coagulation |
| O45.021 | Premature separation of placenta with disseminated intravascular coagulation, first trimester |
| O45.022 | Premature separation of placenta with disseminated intravascular coagulation, second trimester |
| O45.023 | Premature separation of placenta with disseminated intravascular coagulation, third trimester |
| O45.029 | Premature separation of placenta with disseminated intravascular coagulation, unspecified trimester |
| O45.09 | Premature separation of placenta with other coagulation defect |
| O45.091 | Premature separation of placenta with other coagulation defect, first trimester |
| O45.092 | Premature separation of placenta with other coagulation defect, second trimester |
| O45.093 | Premature separation of placenta with other coagulation defect, third trimester |
| O45.099 | Premature separation of placenta with other coagulation defect, unspecified trimester |
| O45.8 | Other premature separation of placenta |
| O45.9 | Premature separation of placenta, unspecified |
| O45.90 | Premature separation of placenta, unspecified, unspecified trimester |
| O45.91 | Premature separation of placenta, unspecified, first trimester |
| O45.92 | Premature separation of placenta, unspecified, second trimester |
| O45.93 | Premature separation of placenta, unspecified, third trimester |
| O46 | Antepartum hemorrhage, not elsewhere classified |
| O46.0 | Antepartum hemorrhage with coagulation defect |
| O46.00 | Antepartum hemorrhage with coagulation defect, unspecified |
| O46.001 | Antepartum hemorrhage with coagulation defect, unspecified, first trimester |
| O46.002 | Antepartum hemorrhage with coagulation defect, unspecified, second trimester |
| O46.003 | Antepartum hemorrhage with coagulation defect, unspecified, third trimester |
| O46.009 | Antepartum hemorrhage with coagulation defect, unspecified, unspecified trimester |
| O46.01 | Antepartum hemorrhage with afibrinogenemia |
| O46.011 | Antepartum hemorrhage with afibrinogenemia, first trimester |
| O46.012 | Antepartum hemorrhage with afibrinogenemia, second trimester |
| O46.013 | Antepartum hemorrhage with afibrinogenemia, third trimester |
| O46.019 | Antepartum hemorrhage with afibrinogenemia, unspecified trimester |
| O46.02 | Antepartum hemorrhage with disseminated intravascular coagulation |
| O46.021 | Antepartum hemorrhage with disseminated intravascular coagulation, first trimester |
| O46.022 | Antepartum hemorrhage with disseminated intravascular coagulation, second trimester |
| O46.023 | Antepartum hemorrhage with disseminated intravascular coagulation, third trimester |
| O46.029 | Antepartum hemorrhage with disseminated intravascular coagulation, unspecified trimester |
| O46.09 | Antepartum hemorrhage with other coagulation defect |
| O46.091 | Antepartum hemorrhage with other coagulation defect, first trimester |
| O46.092 | Antepartum hemorrhage with other coagulation defect, second trimester |
| O46.093 | Antepartum hemorrhage with other coagulation defect, third trimester |
| O46.099 | Antepartum hemorrhage with other coagulation defect, unspecified trimester |
| O46.8 | Other antepartum hemorrhage |
| O46.9 | Antepartum hemorrhage, unspecified |
| O46.90 | Antepartum hemorrhage, unspecified, unspecified trimester |
| O46.91 | Antepartum hemorrhage, unspecified, first trimester |
| O46.92 | Antepartum hemorrhage, unspecified, second trimester |
| O46.93 | Antepartum hemorrhage, unspecified, third trimester |
| O47 | False labor |
| O47.0 | False labor before 37 completed weeks of gestation |
| O47.00 | False labor before 37 completed weeks of gestation, unspecified trimester |
| O47.02 | False labor before 37 completed weeks of gestation, second trimester |
| O47.03 | False labor before 37 completed weeks of gestation, third trimester |
| O47.1 | False labor at or after 37 completed weeks of gestation |
| O47.9 | False labor, unspecified |
| O48 | Late pregnancy |
| O48.0 | Post-term pregnancy |
| O48.1 | Prolonged pregnancy |