ICD-10-CM > O00-O9A > O30-O48 > O41 > O41.0 > O41.03 O41.03 Oligohydramnios, third trimester Non-Billable/Non-Specific Codes O41.03X0..., not applicable or unspecifiedO41.03X1..., fetus 1O41.03X2..., fetus 2O41.03X3..., fetus 3O41.03X4..., fetus 4O41.03X5..., fetus 5O41.03X9..., other fetus