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 :::postpartum atony of uterus without hemorrhage (O75.89)
 * O62.3 Precipitate labor
 * O62.4 Hypertonic, incoordinate, and prolonged uterine contractions
 * Cervical spasm
 * Contraction ring dystocia
 * Dyscoordinate labor
 * Hour-glass contraction of uterus
 * Hypertonic uterine dysfunction
 * Incoordinate uterine action
 * Tetanic contractions
 * Uterine dystocia NOS
 * Uterine spasm
 * Excludes1: dystocia (fetal) (maternal) NOS (O66.9)
 * O62.8 Other abnormalities of forces of labor
 * O62.9 Abnormality of forces of labor, unspecified

O63 Long labor

 * O63.0 Prolonged first stage (of labor)
 * O63.1 Prolonged second stage (of labor)
 * O63.2 Delayed delivery of second twin, triplet, etc.
 * O63.9 Long labor, unspecified
 * Prolonged labor NOS

O64 Obstructed labor due to malposition and malpresentation of fetus

 * One of the following 7th characters is to be assigned to each code under category O64. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O64 that has a 7th character of 1 through 9.
 * 0 not applicable or unspecified
 * 1 fetus 1
 * 2 fetus 2
 * 3 fetus 3
 * 4 fetus 4
 * 5 fetus 5
 * 9 other fetus
 * O64.0 Obstructed labor due to incomplete rotation of fetal head
 * Deep transverse arrest
 * Obstructed labor due to persistent occipitoiliac (position)
 * Obstructed labor due to persistent occipitoposterior (position)
 * Obstructed labor due to persistent occipitosacral (position)
 * Obstructed labor due to persistent occipitotransverse (position)
 * O64.1 Obstructed labor due to breech presentation
 * Obstructed labor due to buttocks presentation