ICD-10-CM > O00-O9A > O30-O48 > O41 > O41.1 > O41.12 > O41.122 O41.122 Chorioamnionitis, second trimester Non-Billable/Non-Specific Codes O41.1220..., not applicable or unspecifiedO41.1221..., fetus 1O41.1222..., fetus 2O41.1223..., fetus 3O41.1224..., fetus 4O41.1225..., fetus 5O41.1229..., other fetus