Polyhydramnios, unspecified trimester, fetus 3

This code signifies an excessive accumulation of amniotic fluid surrounding the third fetus in a multiple gestation pregnancy, where the specific trimester of diagnosis is not documented. Polyhydramnios can lead to various maternal and fetal complications, including preterm labor, placental abruption, and fetal malformations.

Apply this code when documentation indicates polyhydramnios affecting the third fetus in a multifetal pregnancy, but the specific trimester of diagnosis is not specified. This is appropriate when the physician's notes confirm the condition and identify the affected fetus without detailing the gestational age at diagnosis.

• Ensure documentation clearly identifies "fetus 3" as the affected fetus in a multiple gestation.
• Avoid using this code if the trimester of diagnosis is known; instead, use the trimester-specific codes (O40.1, O40.2, O40.3).
• Always code any associated maternal or fetal complications of polyhydramnios separately.