Twin pregnancy, dichorionic/diamniotic, second trimester

This code signifies a twin gestation where each fetus has its own placenta (dichorionic) and its own amniotic sac (diamniotic), specifically identified during the second trimester of pregnancy. This is the least complicated type of twin pregnancy, as each twin has independent support systems.

Use this code when documentation clearly indicates a dichorionic/diamniotic twin pregnancy and the encounter occurs during the second trimester (weeks 14 through 27+6 days). This diagnosis is typically established via ultrasound and confirmed by the ordering physician.

• Ensure the documentation explicitly states "dichorionic/diamniotic" for accurate coding; do not assume based on "twin pregnancy."
• Verify the gestational age to confirm the second trimester; incorrect trimester assignment is a common error.
• This code is a primary diagnosis for the pregnancy itself and may be accompanied by codes for any associated complications.