Polyhydramnios, second trimester, fetus 2

This code signifies an excessive accumulation of amniotic fluid surrounding fetus 2 during the second trimester of a multifetal pregnancy. Polyhydramnios can be idiopathic or associated with maternal conditions like diabetes, or fetal anomalies such as gastrointestinal obstructions or central nervous system defects.

Apply this code when documentation clearly indicates polyhydramnios affecting the second fetus in a multiple gestation, specifically identified during the second trimester (weeks 14 through 27+6 days). Supporting documentation should include ultrasound reports detailing amniotic fluid index (AFI) or deepest vertical pocket (DVP) measurements exceeding normal limits for the gestational age, and explicit identification of the affected fetus.

• Ensure the documentation specifies "fetus 2" in a multifetal pregnancy; if not specified, query the provider.
• Verify the gestational age falls within the second trimester; codes exist for other trimesters.
• Code any associated maternal or fetal conditions contributing to the polyhydramnios as additional diagnoses.