Twin pregnancy, dichorionic/diamniotic, unsp trimester

This code signifies a twin gestation where each fetus has its own chorion and amnion, indicating two separate placentas and two separate amniotic sacs. This is the least complicated type of twin pregnancy, as each twin has its own support system. The specific trimester of the pregnancy is not documented or is unknown.

Apply this code when documentation confirms a dichorionic/diamniotic twin pregnancy but does not specify the trimester. This often occurs in initial diagnostic imaging reports or when the trimester is not clinically relevant for the specific encounter being coded. Documentation should explicitly state "dichorionic/diamniotic twins" or provide imaging findings consistent with this chorionicity/amnionicity.

• Do not use this code if the trimester is known; instead, select the appropriate O30.04- subcategory specifying the trimester.
• Ensure the documentation clearly distinguishes between dichorionic/diamniotic and other types of twin pregnancies (e.g., monochorionic/diamniotic, monochorionic/monoamniotic).
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when monitoring a twin pregnancy.