Twin preg, unable to dtrm num plcnta & amnio sacs, third tri

This code signifies a twin gestation in the third trimester where the chorionicity (number of placentas) and amnionicity (number of amniotic sacs) cannot be determined. This often occurs when imaging is inconclusive or unavailable to definitively classify the type of twin pregnancy.

Apply this code when documentation clearly indicates a twin pregnancy in the third trimester, but the specific chorionicity and amnionicity are unknown or unconfirmed. This is typically supported by ultrasound reports that state "unable to determine" or similar phrasing regarding the placental and amniotic sac count.

• Ensure the documentation specifies "third trimester" for accurate code assignment.
• Do not use this code if chorionicity and amnionicity are clearly documented as monochorionic, dichorionic, monoamniotic, or diamniotic.
• This code is for an unspecified type of twin pregnancy; if the type is known, a more specific O30.0- subcategory should be used.