Triplet pregnancy, trichorionic/triamniotic, third trimester

This code signifies 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 regarding shared placental structures. The pregnancy has progressed into the third trimester.

Apply this code when documentation clearly indicates a triplet gestation with trichorionic/triamniotic placentation and the patient is in the third trimester of pregnancy. Ultrasound reports confirming three separate placentas and amniotic sacs, along with gestational age indicating the third trimester, support its use.

• Ensure documentation explicitly states "trichorionic" and "triamniotic" for all three fetuses.
• Verify the gestational age falls within the third trimester (typically starting at 28 weeks).
• Do not confuse with monochorionic or dichorionic triplet pregnancies, which have different code assignments.