Triplet preg w two or more monochorionic fetuses, second tri

This code signifies a pregnancy involving three fetuses where at least two of them share a single chorion, indicating they are monozygotic (identical) and share a placenta. This specific instance occurs during the second trimester of gestation, which typically spans from week 13 through week 27.

Apply this code when documentation clearly indicates a triplet pregnancy with monochorionic-diamniotic or monochorionic-monoamniotic twins, alongside a third fetus, and the gestational age falls within the second trimester. Supporting documentation includes ultrasound reports confirming chorionicity and fetal count, as well as physician notes specifying the trimester.

• Always confirm the number of fetuses and the chorionicity (monochorionic vs. dichorionic) from imaging reports.
• Verify the gestational age to ensure the pregnancy is definitively in the second trimester.
• Do not confuse with codes for dichorionic triplet pregnancies or those specific to other trimesters.