Oligohydramnios, third trimester, fetus 1

This code signifies a reduced amount of amniotic fluid surrounding the fetus during the third trimester of pregnancy. Oligohydramnios can indicate potential fetal compromise, renal anomalies, or placental insufficiency.

Apply this code when documentation confirms oligohydramnios in a singleton pregnancy during the third trimester (28 weeks gestation to delivery). This diagnosis is typically made via ultrasound measurement of the amniotic fluid index (AFI) or deepest vertical pocket (DVP).

• Ensure the documentation explicitly states "third trimester" and refers to "fetus 1" for singleton pregnancies.
• Distinguish from oligohydramnios occurring in earlier trimesters (O41.01- or O41.02-).
• Always sequence this code after the primary obstetric complication or condition, if applicable.