Polyhydramnios, third trimester, fetus 3

This code signifies an excessive accumulation of amniotic fluid surrounding the third fetus in a multiple gestation pregnancy during the third trimester. This condition can lead to various maternal and fetal complications, including preterm labor, placental abruption, and fetal malpresentation.

Apply this code when documentation confirms polyhydramnios in the third trimester specifically affecting the third fetus in a multifetal pregnancy. Supporting documentation should include ultrasound reports detailing amniotic fluid index (AFI) or deepest vertical pocket (DVP) measurements exceeding normal limits for gestational age, along with clear identification of the affected fetus.

• Ensure the documentation explicitly identifies the third fetus as having polyhydramnios; otherwise, use a less specific code.
• Always sequence this code after the primary code for the multifetal pregnancy (e.g., O30.1-).
• Verify the gestational age falls within the third trimester (28 weeks 0 days to 40 weeks 6 days) for accurate code assignment.