Oligohydramnios, unspecified trimester, fetus 4

This code signifies a reduced amount of amniotic fluid surrounding the fetus, where the specific trimester of pregnancy is not documented. It indicates a diagnosis of oligohydramnios affecting the fourth fetus in a multiple gestation pregnancy.

Use this code when the medical record clearly states oligohydramnios in a multiple gestation pregnancy involving four fetuses, and the trimester of onset or diagnosis is not specified. Documentation should confirm the presence of oligohydramnios and the fetal count.

• Ensure documentation specifies "fetus 4" in a multiple gestation.
• Avoid using this code if the trimester is known; instead, use the trimester-specific codes (O41.01-O41.03).
• Always sequence this code after the primary obstetric code indicating the type of multiple gestation.