Twin pregnancy, dichorionic/diamniotic, first trimester

This code identifies a twin pregnancy where each fetus has its own chorion and amnion, meaning they are in separate sacs and have separate placentas. This is the least complicated type of twin pregnancy from a placental and amniotic sac perspective. The pregnancy is currently in the first trimester.

Use this code when documentation clearly indicates a dichorionic/diamniotic twin gestation confirmed by ultrasound in the first trimester. This is typically identified early in pregnancy during routine obstetric imaging. The documentation should explicitly state "dichorionic/diamniotic" or provide findings consistent with this, such as two separate placentas and two separate amniotic sacs.

• Ensure the documentation specifies "dichorionic/diamniotic" and not just "twin pregnancy."
• Verify the trimester documented; this code is specific to the first trimester.
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, followed by any other relevant codes for complications or routine care.