ICD-10-CM > O00-O9A > O30-O48 > O41 > O41.8 > O41.8X > O41.8X2 O41.8X2 Other specified disorders of amniotic fluid and membranes, second trimester Non-Billable/Non-Specific Codes O41.8X20..., not applicable or unspecifiedO41.8X21..., fetus 1O41.8X22..., fetus 2O41.8X23..., fetus 3O41.8X24..., fetus 4O41.8X25..., fetus 5O41.8X29..., other fetus