Quad preg w two or more monoamnio fetuses, second trimester

This code identifies a pregnancy involving four fetuses, where at least two of these fetuses share the same amniotic sac (monoamniotic). This specific diagnosis applies during the second trimester of gestation. It indicates a complex multifetal pregnancy with increased risks due to the shared amniotic environment.

Use this code when documentation clearly indicates a quadruplet pregnancy with at least two monoamniotic fetuses, confirmed during the second trimester (typically weeks 13-27). This diagnosis is often established via ultrasound imaging. Supporting documentation should specify the number of fetuses and the chorionicity/amnionicity of each.

• Ensure documentation explicitly states "quadruplet" and "monoamniotic" for at least two fetuses.
• Verify the gestational age falls within the second trimester for accurate coding.
• Do not confuse with codes for triplet or other multifetal pregnancies with different amnionicity configurations.