Polyhydramnios, first trimester, fetus 4

This code signifies an excessive accumulation of amniotic fluid surrounding the fetus during the first trimester of pregnancy, specifically when referring to the fourth fetus in a multiple gestation. Polyhydramnios can lead to various maternal and fetal complications.

Apply this code when documentation clearly indicates polyhydramnios diagnosed in the first trimester of a multiple gestation pregnancy, and the condition is attributed to the fourth fetus. Supporting documentation would include ultrasound reports detailing amniotic fluid index (AFI) or deepest vertical pocket (DVP) measurements exceeding normal limits for the gestational age, along with identification of the affected fetus.

• Ensure the documentation explicitly states "first trimester" and identifies the "fourth fetus" in a multiple gestation.
• Do not confuse with codes for polyhydramnios in other trimesters or for a different fetal number.
• Always sequence this code as a secondary diagnosis, following the code for the type of multiple gestation (e.g., O30.2- for quadruplet pregnancy).