Oth multiple gest, unsp num plcnta & amnio sacs, first tri

This code signifies a pregnancy involving more than one fetus where the specific type of multiple gestation (e.g., twins, triplets) is known, but the number of placentas and amniotic sacs has not yet been determined. This diagnosis is made during the first trimester of pregnancy.

Use this code when documentation indicates a multiple gestation pregnancy in the first trimester, and the provider has specified the type of multiple gestation (e.g., "twin pregnancy," "triplet pregnancy") but has not yet documented chorionicity or amnionicity. This often occurs early in gestation before these details can be definitively visualized via ultrasound.

• Ensure the documentation explicitly states "first trimester" for accurate trimester assignment.
• Do not use this code if chorionicity and amnionicity have been determined and documented (e.g., dichorionic/diamniotic twins).
• Sequence this code as the principal diagnosis when the multiple gestation is the primary reason for the encounter.