ICD-10-CM > O00-O9A > O30-O48 > O41 > O41.9 > O41.90 O41.90 Disorder of amniotic fluid and membranes, unspecified, unspecified trimester Non-Billable/Non-Specific Codes O41.90X0..., not applicable or unspecifiedO41.90X1..., fetus 1O41.90X2..., fetus 2O41.90X3..., fetus 3O41.90X4..., fetus 4O41.90X5..., fetus 5O41.90X9..., other fetus