ICD-10-CM > O00-O9A > O30-O48 > O31 > O31.2 > O31.23 O31.23 Continuing pregnancy after intrauterine death of one fetus or more, third trimester Non-Billable/Non-Specific Codes O31.23X0..., not applicable or unspecifiedO31.23X1..., fetus 1O31.23X2..., fetus 2O31.23X3..., fetus 3O31.23X4..., fetus 4O31.23X5..., fetus 5O31.23X9..., other fetus