Oligohydramnios, second trimester, other fetus

This code signifies a reduced amount of amniotic fluid surrounding a fetus during the second trimester of pregnancy, specifically when there are multiple gestations and this condition affects a fetus other than the one designated as "first." Oligohydramnios can lead to various complications for the developing fetus.

Apply this code when documentation clearly indicates oligohydramnios identified in the second trimester for a multifetal pregnancy, and the affected fetus is not the primary one (e.g., fetus B, C, etc.). Supporting documentation should include ultrasound reports detailing amniotic fluid index (AFI) or deepest vertical pocket (DVP) measurements below established norms for the gestational age, along with the specific fetus affected.

• Ensure the documentation specifies "second trimester" and identifies which fetus is affected in a multiple gestation.
• Distinguish this from oligohydramnios affecting the first fetus (O41.02X1) or unspecified fetus (O41.02X0).
• Always sequence this code after the primary code for the multifetal pregnancy (e.g., O30.0-).