Oligohydramnios, first trimester, fetus 1

This code signifies an abnormally low volume of amniotic fluid surrounding the fetus during the first trimester of pregnancy. Oligohydramnios can indicate potential fetal renal anomalies, placental insufficiency, or other underlying maternal or fetal conditions.

Assign this code when documentation explicitly states oligohydramnios diagnosed in the first trimester for a singleton pregnancy. This diagnosis is typically made via ultrasound measurement of the amniotic fluid index (AFI) or deepest vertical pocket (DVP).

• Ensure the trimester is clearly documented as "first trimester" to support this specific code.
• Verify the documentation specifies a singleton pregnancy; if multiple gestations, a different code will be required.
• Look for associated conditions or causes of oligohydramnios, which may require additional codes.