| O620 | Primary inadequate contractions |
| O621 | Secondary uterine inertia |
| O622 | Other uterine inertia |
| O623 | Precipitate labor |
| O624 | Hypertonic, incoordinate, and prolonged uterine contractions Hypertonic, incoordinate, and prolonged uterine contractions |
| O628 | Other abnormalities of forces of labor |
| O629 | Abnormality of forces of labor, unspecified |
| O63 | Long labor |
| O630 | Prolonged first stage (of labor) |
| O631 | Prolonged second stage (of labor) |
| O632 | Delayed delivery of second twin, triplet, etc. |
| O639 | Long labor, unspecified |
| O64 | Obstructed labor due to malposition and malpresentation of fetus |
| O640 | Obstructed labor due to incomplete rotation of fetal head |
| O640XX0 | Obstructed labor due to incomplete rotation of fetal head, not applicable or unspecified |
| O640XX1 | Obstructed labor due to incomplete rotation of fetal head, fetus 1 |
| O640XX2 | Obstructed labor due to incomplete rotation of fetal head, fetus 2 |
| O640XX3 | Obstructed labor due to incomplete rotation of fetal head, fetus 3 |
| O640XX4 | Obstructed labor due to incomplete rotation of fetal head, fetus 4 |
| O640XX5 | Obstructed labor due to incomplete rotation of fetal head, fetus 5 |
| O640XX9 | Obstructed labor due to incomplete rotation of fetal head, other fetus |
| O641 | Obstructed labor due to breech presentation |
| O641XX0 | Obstructed labor due to breech presentation, not applicable or unspecified |
| O641XX1 | Obstructed labor due to breech presentation, fetus 1 |
| O641XX2 | Obstructed labor due to breech presentation, fetus 2 |
| O641XX3 | Obstructed labor due to breech presentation, fetus 3 |
| O641XX4 | Obstructed labor due to breech presentation, fetus 4 |
| O641XX5 | Obstructed labor due to breech presentation, fetus 5 |
| O641XX9 | Obstructed labor due to breech presentation, other fetus |
| O642 | Obstructed labor due to face presentation |
| O642XX0 | Obstructed labor due to face presentation, not applicable or unspecified |
| O642XX1 | Obstructed labor due to face presentation, fetus 1 |
| O642XX2 | Obstructed labor due to face presentation, fetus 2 |
| O642XX3 | Obstructed labor due to face presentation, fetus 3 |
| O642XX4 | Obstructed labor due to face presentation, fetus 4 |
| O642XX5 | Obstructed labor due to face presentation, fetus 5 |
| O642XX9 | Obstructed labor due to face presentation, other fetus |
| O643 | Obstructed labor due to brow presentation |
| O643XX0 | Obstructed labor due to brow presentation, not applicable or unspecified |
| O643XX1 | Obstructed labor due to brow presentation, fetus 1 |
| O643XX2 | Obstructed labor due to brow presentation, fetus 2 |
| O643XX3 | Obstructed labor due to brow presentation, fetus 3 |
| O643XX4 | Obstructed labor due to brow presentation, fetus 4 |
| O643XX5 | Obstructed labor due to brow presentation, fetus 5 |
| O643XX9 | Obstructed labor due to brow presentation, other fetus |
| O644 | Obstructed labor due to shoulder presentation |
| O644XX0 | Obstructed labor due to shoulder presentation, not applicable or unspecified |
| O644XX1 | Obstructed labor due to shoulder presentation, fetus 1 |
| O644XX2 | Obstructed labor due to shoulder presentation, fetus 2 |
| O644XX3 | Obstructed labor due to shoulder presentation, fetus 3 |