| O4101X9 | Oligohydramnios, first trimester, other fetus |
| O4102 | Oligohydramnios, second trimester |
| O4102X0 | Oligohydramnios, second trimester, not applicable or unspecified |
| O4102X1 | Oligohydramnios, second trimester, fetus 1 |
| O4102X2 | Oligohydramnios, second trimester, fetus 2 |
| O4102X3 | Oligohydramnios, second trimester, fetus 3 |
| O4102X4 | Oligohydramnios, second trimester, fetus 4 |
| O4102X5 | Oligohydramnios, second trimester, fetus 5 |
| O4102X9 | Oligohydramnios, second trimester, other fetus |
| O4103 | Oligohydramnios, third trimester |
| O4103X0 | Oligohydramnios, third trimester, not applicable or unspecified |
| O4103X1 | Oligohydramnios, third trimester, fetus 1 |
| O4103X2 | Oligohydramnios, third trimester, fetus 2 |
| O4103X3 | Oligohydramnios, third trimester, fetus 3 |
| O4103X4 | Oligohydramnios, third trimester, fetus 4 |
| O4103X5 | Oligohydramnios, third trimester, fetus 5 |
| O4103X9 | Oligohydramnios, third trimester, other fetus |
| O411 | Infection of amniotic sac and membranes |
| O4110 | Infection of amniotic sac and membranes, unspecified |
| O41101 | Infection of amniotic sac and membranes, unspecified, first trimester |
| O411010 | Infection of amniotic sac and membranes, unspecified, first trimester, not applicable or unspecified |
| O411011 | Infection of amniotic sac and membranes, unspecified, first trimester, fetus 1 |
| O411012 | Infection of amniotic sac and membranes, unspecified, first trimester, fetus 2 |
| O411013 | Infection of amniotic sac and membranes, unspecified, first trimester, fetus 3 |
| O411014 | Infection of amniotic sac and membranes, unspecified, first trimester, fetus 4 |
| O411015 | Infection of amniotic sac and membranes, unspecified, first trimester, fetus 5 |
| O411019 | Infection of amniotic sac and membranes, unspecified, first trimester, other fetus |
| O41102 | Infection of amniotic sac and membranes, unspecified, second trimester |
| O411020 | Infection of amniotic sac and membranes, unspecified, second trimester, not applicable or unspecified |
| O411021 | Infct of amniotic sac and membrns, unsp, second tri, fetus 1 Infection of amniotic sac and membranes, unspecified, second trimester, fetus 1 |
| O411022 | Infct of amniotic sac and membrns, unsp, second tri, fetus 2 Infection of amniotic sac and membranes, unspecified, second trimester, fetus 2 |
| O411023 | Infct of amniotic sac and membrns, unsp, second tri, fetus 3 Infection of amniotic sac and membranes, unspecified, second trimester, fetus 3 |
| O411024 | Infct of amniotic sac and membrns, unsp, second tri, fetus 4 Infection of amniotic sac and membranes, unspecified, second trimester, fetus 4 |
| O411025 | Infct of amniotic sac and membrns, unsp, second tri, fetus 5 Infection of amniotic sac and membranes, unspecified, second trimester, fetus 5 |
| O411029 | Infection of amniotic sac and membranes, unspecified, second trimester, other fetus |
| O41103 | Infection of amniotic sac and membranes, unspecified, third trimester |
| O411030 | Infection of amniotic sac and membranes, unspecified, third trimester, not applicable or unspecified |
| O411031 | Infection of amniotic sac and membranes, unspecified, third trimester, fetus 1 |
| O411032 | Infection of amniotic sac and membranes, unspecified, third trimester, fetus 2 |
| O411033 | Infection of amniotic sac and membranes, unspecified, third trimester, fetus 3 |
| O411034 | Infection of amniotic sac and membranes, unspecified, third trimester, fetus 4 |
| O411035 | Infection of amniotic sac and membranes, unspecified, third trimester, fetus 5 |
| O411039 | Infection of amniotic sac and membranes, unspecified, third trimester, other fetus |
| O41109 | Infection of amniotic sac and membranes, unspecified, unspecified trimester |
| O411090 | Infection of amniotic sac and membranes, unspecified, unspecified trimester, not applicable or unspecified |
| O411091 | Infection of amniotic sac and membranes, unspecified, unspecified trimester, fetus 1 |
| O411092 | Infection of amniotic sac and membranes, unspecified, unspecified trimester, fetus 2 |
| O411093 | Infection of amniotic sac and membranes, unspecified, unspecified trimester, fetus 3 |
| O411094 | Infection of amniotic sac and membranes, unspecified, unspecified trimester, fetus 4 |
| O411095 | Infection of amniotic sac and membranes, unspecified, unspecified trimester, fetus 5 |