ICD-10-CM > O00-O9A > O60-O77 > O60 > O60.1 > O60.12 O60.12 Preterm labor second trimester with preterm delivery second trimester Non-Billable/Non-Specific Codes O60.12X0..., not applicable or unspecifiedO60.12X1..., fetus 1O60.12X2..., fetus 2O60.12X3..., fetus 3O60.12X4..., fetus 4O60.12X5..., fetus 5O60.12X9..., other fetus