| O40 | Polyhydramnios |
| O401 | Polyhydramnios, first trimester |
| O401XX0 | Polyhydramnios, first trimester, not applicable or unspecified |
| O401XX1 | Polyhydramnios, first trimester, fetus 1 |
| O401XX2 | Polyhydramnios, first trimester, fetus 2 |
| O401XX3 | Polyhydramnios, first trimester, fetus 3 |
| O401XX4 | Polyhydramnios, first trimester, fetus 4 |
| O401XX5 | Polyhydramnios, first trimester, fetus 5 |
| O401XX9 | Polyhydramnios, first trimester, other fetus |
| O402 | Polyhydramnios, second trimester |
| O402XX0 | Polyhydramnios, second trimester, not applicable or unspecified |
| O402XX1 | Polyhydramnios, second trimester, fetus 1 |
| O402XX2 | Polyhydramnios, second trimester, fetus 2 |
| O402XX3 | Polyhydramnios, second trimester, fetus 3 |
| O402XX4 | Polyhydramnios, second trimester, fetus 4 |
| O402XX5 | Polyhydramnios, second trimester, fetus 5 |
| O402XX9 | Polyhydramnios, second trimester, other fetus |
| O403 | Polyhydramnios, third trimester |
| O403XX0 | Polyhydramnios, third trimester, not applicable or unspecified |
| O403XX1 | Polyhydramnios, third trimester, fetus 1 |
| O403XX2 | Polyhydramnios, third trimester, fetus 2 |
| O403XX3 | Polyhydramnios, third trimester, fetus 3 |
| O403XX4 | Polyhydramnios, third trimester, fetus 4 |
| O403XX5 | Polyhydramnios, third trimester, fetus 5 |
| O403XX9 | Polyhydramnios, third trimester, other fetus |
| O409 | Polyhydramnios, unspecified trimester |
| O409XX0 | Polyhydramnios, unspecified trimester, not applicable or unspecified |
| O409XX1 | Polyhydramnios, unspecified trimester, fetus 1 |
| O409XX2 | Polyhydramnios, unspecified trimester, fetus 2 |
| O409XX3 | Polyhydramnios, unspecified trimester, fetus 3 |
| O409XX4 | Polyhydramnios, unspecified trimester, fetus 4 |
| O409XX5 | Polyhydramnios, unspecified trimester, fetus 5 |
| O409XX9 | Polyhydramnios, unspecified trimester, other fetus |
| O41 | Other disorders of amniotic fluid and membranes |
| O410 | Oligohydramnios |
| O4100 | Oligohydramnios, unspecified trimester |
| O4100X0 | Oligohydramnios, unspecified trimester, not applicable or unspecified |
| O4100X1 | Oligohydramnios, unspecified trimester, fetus 1 |
| O4100X2 | Oligohydramnios, unspecified trimester, fetus 2 |
| O4100X3 | Oligohydramnios, unspecified trimester, fetus 3 |
| O4100X4 | Oligohydramnios, unspecified trimester, fetus 4 |
| O4100X5 | Oligohydramnios, unspecified trimester, fetus 5 |
| O4100X9 | Oligohydramnios, unspecified trimester, other fetus |
| O4101 | Oligohydramnios, first trimester |
| O4101X0 | Oligohydramnios, first trimester, not applicable or unspecified |
| O4101X1 | Oligohydramnios, first trimester, fetus 1 |
| O4101X2 | Oligohydramnios, first trimester, fetus 2 |
| O4101X3 | Oligohydramnios, first trimester, fetus 3 |
| O4101X4 | Oligohydramnios, first trimester, fetus 4 |
| O4101X5 | Oligohydramnios, first trimester, fetus 5 |