Oth multiple gest w two or more monoamnio fetuses, third tri

This code signifies a pregnancy involving two or more fetuses that share a single amniotic sac (monoamniotic) and are in the third trimester. It is used when the specific type of multiple gestation is not otherwise classified but is known to involve monoamniotic twins or higher-order multiples.

Apply this code when documentation clearly indicates a multiple gestation (e.g., twins, triplets) with all fetuses residing within a single amniotic sac, and the pregnancy has progressed into the third trimester. Supporting documentation would include ultrasound reports confirming monoamniotic status and gestational age, as well as physician notes detailing the multiple gestation.

• Ensure documentation explicitly states "monoamniotic" for all fetuses and confirms third-trimester status.
• Do not use this code for dichorionic/diamniotic or monochorionic/diamniotic multiple gestations.
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, followed by codes for any associated complications.