Quad preg w two or more monoamnio fetuses, first trimester

This code identifies a pregnancy involving four fetuses where at least two of these fetuses share a single amniotic sac. This specific diagnosis applies during the first trimester of gestation. It signifies a high-risk multifetal pregnancy due to the shared amniotic environment.

Apply this code when documentation clearly indicates a quadruplet pregnancy with at least two fetuses confirmed to be monoamniotic, and the encounter occurs within the first trimester. This diagnosis is typically established via ultrasound imaging that visualizes the number of fetuses and their respective amniotic sacs.

• Ensure documentation specifies "quadruplet" and "monoamniotic" for at least two fetuses.
• Verify the gestational age falls within the first trimester (up to the end of the 13th week).
• Do not confuse with codes for dichorionic/diamniotic or other multifetal gestations.