ICD-10-CM > O00-O9A > O30-O48 > O31 > O31.1 > O31.11 O31.11 Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester Non-Billable/Non-Specific Codes O31.11X0..., not applicable or unspecifiedO31.11X1..., fetus 1O31.11X2..., fetus 2O31.11X3..., fetus 3O31.11X4..., fetus 4O31.11X5..., fetus 5O31.11X9..., other fetus