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