ICD-10-CM > O00-O9A > O30-O48 > O41 > O41.9 > O41.91 O41.91 Disorder of amniotic fluid and membranes, unspecified, first trimester Non-Billable/Non-Specific Codes O41.91X0..., not applicable or unspecifiedO41.91X1..., fetus 1O41.91X2..., fetus 2O41.91X3..., fetus 3O41.91X4..., fetus 4O41.91X5..., fetus 5O41.91X9..., other fetus