Obstructed labor due to locked twins

This code signifies a complication during labor where the delivery of twins is obstructed because the fetuses are physically interlocked, preventing their passage through the birth canal. This interlocking can involve heads, limbs, or bodies, making spontaneous vaginal delivery impossible without intervention.

Apply this code when documentation clearly indicates that labor is obstructed specifically due to the physical entanglement of twin fetuses. This typically requires surgical intervention, such as a Cesarean section, to resolve the obstruction. Documentation should explicitly state "locked twins" or describe the physical interlocking causing the obstruction.

• Ensure documentation specifies "locked twins" as the cause of obstruction, not just general obstructed labor or malpresentation.
• This code is a primary diagnosis for the maternal complication; sequence it before codes for the outcome of delivery or procedures performed.
• Do not confuse with other obstructed labor codes (e.g., O64.-, O65.-) unless the specific cause is documented as locked twins.