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Definition: Two individuals derived from two fetuses that were fertilized at or about the same time, developed in the uterus simultaneously, and born to the same mother. Twins are either monozygotic or dizygotic.

Body System: Reproductive

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ICD10 Codes Containing Term: twins

O66.1 Obstructed labor due to locked twins
Q89.4 Conjoined twins
Z37.2 Twins, both liveborn
Z37.3 Twins, one liveborn and one stillborn
Z37.4 Twins, both stillborn
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