Oligohydramnios, unspecified trimester, fetus 2

This code signifies a reduced amount of amniotic fluid surrounding fetus 2 in a multiple gestation pregnancy, where the specific trimester of diagnosis is not documented. Oligohydramnios can lead to various fetal complications, including pulmonary hypoplasia, skeletal deformities, and umbilical cord compression.

Apply this code when documentation indicates oligohydramnios affecting the second fetus in a multiple pregnancy, but the specific trimester of onset or diagnosis is not specified. This is typically supported by ultrasound reports detailing amniotic fluid index (AFI) or deepest vertical pocket (DVP) measurements below established norms for the gestational age.

• Ensure the documentation clearly identifies "fetus 2" in a multiple gestation.
• If the trimester is known, use a more specific code from the O41.0- series (e.g., O41.01X2 for first trimester).
• Always sequence this code after the primary obstetric complication or condition, if applicable.