ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.1 > O36.19 > O36.193 O36.193 Maternal care for other isoimmunization, third trimester Non-Billable/Non-Specific Codes O36.1930..., not applicable or unspecifiedO36.1931..., fetus 1O36.1932..., fetus 2O36.1933..., fetus 3O36.1934..., fetus 4O36.1935..., fetus 5O36.1939..., other fetus