Polyhydramnios, second trimester, other fetus

This code signifies an excessive accumulation of amniotic fluid surrounding the fetus during the second trimester of pregnancy, specifically when it affects a fetus other than the one primarily being monitored or if there are multiple gestations. This condition can indicate underlying fetal anomalies, maternal health issues, or be idiopathic.

Use this code when documentation clearly states polyhydramnios diagnosed in the second trimester, and it is specified as affecting an "other fetus" in a multiple gestation or if the primary fetus is not the one with polyhydramnios. Supporting documentation includes ultrasound reports detailing amniotic fluid index (AFI) measurements or deepest vertical pocket (DVP) indicating polyhydramnios, along with gestational age.

• Ensure the documentation specifies "second trimester" and "other fetus" to accurately assign this code.
• Distinguish from polyhydramnios affecting the primary fetus (O40.2XX0) or unspecified fetus (O40.2XXA).
• Always sequence this code after the primary obstetric code indicating the pregnancy.