Polyhydramnios, first trimester, fetus 2

This code signifies an excessive accumulation of amniotic fluid surrounding the second fetus during the first trimester of a multiple gestation pregnancy. Polyhydramnios is a condition where the amniotic fluid index (AFI) or deepest vertical pocket (DVP) measurements exceed established norms for gestational age.

Use this code when documentation clearly indicates polyhydramnios affecting the second fetus in a multiple gestation pregnancy, specifically identified within the first trimester. Supporting documentation should include ultrasound findings detailing amniotic fluid levels and confirmation of gestational age and fetal number.

• Ensure the documentation specifies "fetus 2" and "first trimester" to accurately assign this code.
• Distinguish from polyhydramnios affecting other fetuses in a multiple gestation (e.g., fetus 1, fetus 3) or occurring in different trimesters.
• Always sequence this code after the primary code for the multiple gestation, such as O30.0-.