O66 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Other obstructed labor.
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Obstructed labor due to shoulder dystocia
Obstructed labor due to locked twins
Obstructed labor due to unusually large fetus
Obstructed labor due to other abnormalities of fetus
Failed trial of labor
Attempted application of vacuum extractor and forceps
Obstructed labor due to other multiple fetuses
Other specified obstructed labor
Obstructed labor, unspecified
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