ICD-10-CM > O00-O9A > O30-O48 > O40 > O40.2 O40.2 Polyhydramnios, second trimester Non-Billable/Non-Specific Codes O40.2XX0..., not applicable or unspecifiedO40.2XX1..., fetus 1O40.2XX2..., fetus 2O40.2XX3..., fetus 3O40.2XX4..., fetus 4O40.2XX5..., fetus 5O40.2XX9..., other fetus