ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.1 > O36.19 > O36.192 O36.192 Maternal care for other isoimmunization, second trimester Non-Billable/Non-Specific Codes O36.1920..., not applicable or unspecifiedO36.1921..., fetus 1O36.1922..., fetus 2O36.1923..., fetus 3O36.1924..., fetus 4O36.1925..., fetus 5O36.1929..., other fetus