ICD-10-CM > O00-O9A > O30-O48 > O41 > O41.1 > O41.12 > O41.123 O41.123 Chorioamnionitis, third trimester Non-Billable/Non-Specific Codes O41.1230..., not applicable or unspecifiedO41.1231..., fetus 1O41.1232..., fetus 2O41.1233..., fetus 3O41.1234..., fetus 4O41.1235..., fetus 5O41.1239..., other fetus