ICD-10-CM > O00-O9A > O60-O77 > O60 > O60.1 > O60.13 O60.13 Preterm labor second trimester with preterm delivery third trimester Non-Billable/Non-Specific Codes O60.13X0..., not applicable or unspecifiedO60.13X1..., fetus 1O60.13X2..., fetus 2O60.13X3..., fetus 3O60.13X4..., fetus 4O60.13X5..., fetus 5O60.13X9..., other fetus