Triplet preg w two or more monoamnio fetuses, second tri

This code signifies a triplet gestation where at least two of the fetuses share a single amniotic sac, and the pregnancy is currently in the second trimester. This is a high-risk pregnancy due to the potential for complications such as cord entanglement and twin-to-twin transfusion syndrome (TTTS) among the monoamniotic fetuses.

Apply this code when documentation clearly indicates a triplet pregnancy with two or more fetuses identified as monoamniotic, and the gestational age falls within the second trimester (weeks 14 through 27, 6 days). Supporting documentation includes ultrasound reports confirming chorionicity and amnionicity, and physician notes specifying the trimester.

• Ensure documentation explicitly states "triplet pregnancy" and "monoamniotic" for at least two fetuses.
• Verify the gestational age falls precisely within the second trimester; use O30.11- for first trimester or O30.13- for third trimester.
• Do not confuse with dichorionic/diamniotic or monochorionic/diamniotic triplet pregnancies, which have different code assignments.