Oth mult gest w two or more monochorionic fetuses, first tri

This code signifies a pregnancy involving multiple fetuses, where at least two of them share a single chorion (monochorionic), and the pregnancy is currently in the first trimester. This condition carries increased risks for both mother and fetuses due to potential complications like twin-to-twin transfusion syndrome (TTTS) or selective intrauterine growth restriction (sIUGR).

Apply this code when documentation confirms a multiple gestation with at least two monochorionic fetuses identified during the first trimester. This diagnosis is typically established via ultrasound, which visualizes the number of chorions and amnions. The medical record must clearly state the chorionicity and gestational age.

• Ensure documentation explicitly states "monochorionic" for at least two fetuses, not just "multiple gestation."
• Verify the gestational age falls within the first trimester (0-13 weeks 6 days).
• Do not use this code if the chorionicity is unknown or if the pregnancy has progressed beyond the first trimester.