Z37 - Outcome of delivery
Z37.5 - Other multiple births, all liveborn
Z37.50 - Multiple births, unspecified, all liveborn
Z37.51 - Triplets, all liveborn
Z37.52 - Quadruplets, all liveborn
Z37.53 - Quintuplets, all liveborn
Z37.54 - Sextuplets, all liveborn
Z37.59 - Other multiple births, all liveborn