Quad preg, quadrachorionic/quadra-amniotic, second trimester

This code identifies a pregnancy involving four fetuses, each with its own chorion and amniotic sac, during the second trimester (weeks 14 through 27+6 days). This specific type of quadruplet pregnancy indicates that all four fetuses are genetically distinct, originating from four separate fertilized eggs.

Assign this code when documentation clearly states a quadrachorionic/quadra-amniotic quadruplet gestation in the second trimester. This diagnosis is typically confirmed via ultrasound imaging, which visualizes four distinct gestational sacs and fetuses, along with the corresponding chorionicity and amnionicity.

• Ensure the documentation explicitly states "quadrachorionic" and "quadra-amniotic" to differentiate from other chorionicity/amnionicity combinations.
• Verify the gestational age falls within the second trimester (14 weeks 0 days to 27 weeks 6 days).
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when monitoring the pregnancy.