ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.8 > O36.82 > O36.823 O36.823 Fetal anemia and thrombocytopenia, third trimester Non-Billable/Non-Specific Codes O36.8230..., not applicable or unspecifiedO36.8231..., fetus 1O36.8232..., fetus 2O36.8233..., fetus 3O36.8234..., fetus 4O36.8235..., fetus 5O36.8239..., other fetus