Triplet pregnancy, trichorionic/triamniotic, first trimester

This code identifies a pregnancy involving three fetuses, where each fetus has its own chorion and amnion. This is the least common and typically lowest-risk type of triplet pregnancy, as each fetus is independently supported. The diagnosis is specifically for the first trimester of gestation.

Apply this code when documentation clearly indicates a triplet gestation with trichorionic/triamniotic placentation, confirmed during the first trimester. This is typically established via ultrasound imaging that visualizes three separate gestational sacs, each with its own placenta and amniotic membrane.

• Ensure the documentation explicitly states "trichorionic/triamniotic" and "triplet pregnancy."
• Verify the gestational age falls within the first trimester (up to the end of the 13th week).
• Do not confuse with other chorionicity/amnionicity combinations for triplet pregnancies (e.g., O30.11- or O30.12-).