ICD-10-CM > O00-O9A > O30-O48 > O31 > O31.2 > O31.21 O31.21 Continuing pregnancy after intrauterine death of one fetus or more, first trimester Non-Billable/Non-Specific Codes O31.21X0..., not applicable or unspecifiedO31.21X1..., fetus 1O31.21X2..., fetus 2O31.21X3..., fetus 3O31.21X4..., fetus 4O31.21X5..., fetus 5O31.21X9..., other fetus