Oth mult gest, num chorions & amnions = num ftses, 2nd tri

This code describes a pregnancy involving more than one fetus, where each fetus has its own chorion and amnion (dichorionic-diamniotic), and the pregnancy is currently in the second trimester. This is a common and generally lower-risk type of multiple gestation, as each fetus has its own separate sac.

Use this code when documentation clearly indicates a multiple gestation (e.g., twins, triplets) where the number of chorions and amnions precisely matches the number of fetuses, and the gestational age falls within the second trimester (typically weeks 14 through 27+6 days). This is often confirmed by ultrasound findings.

• Ensure the documentation explicitly states "dichorionic-diamniotic" or equivalent (e.g., "each fetus with its own sac") and confirms the second trimester.
• Do not use this code if the number of chorions/amnions is not equal to the number of fetuses (e.g., monochorionic-diamniotic).
• Always sequence this code as a secondary diagnosis, following the primary code for the type of multiple gestation (e.g., O30.0- for twin pregnancy).