O66.4 Failed trial of laborNon-billable header with 2 child codes.
O66.40 Failed trial of labor, unspecifiedO66.41 Failed attempted vaginal birth after previous cesarean deliveryO33 Maternal care for disproportion ("disproportion with obstructed labor (O65-O66)")O66 Other obstructed laborO66.0 Obstructed labor due to shoulder dystociaO66.1 Obstructed labor due to locked twinsO66.2 Obstructed labor due to unusually large fetusO66.3 Obstructed labor due to other abnormalities of fetusO66.4 Failed trial of labor (this code)O66.40 Failed trial of labor, unspecifiedO66.41 Failed attempted vaginal birth after previous cesarean deliveryO66.5 Attempted application of vacuum extractor and forcepsO66.6 Obstructed labor due to other multiple fetusesO66.8 Other specified obstructed labor