Oth mult gest, unab to dtrm num plcnta & amnio sacs, 2nd 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 (chorionicity) and amniotic sacs (amnionicity) cannot be determined. This uncertainty occurs during the second trimester of gestation.

Apply this code when documentation clearly states a multiple gestation (e.g., "twin pregnancy," "triplet pregnancy") but imaging or clinical assessment in the second trimester is inconclusive regarding chorionicity and amnionicity. This is often used when ultrasound reports indicate "unable to visualize chorionicity/amnionicity" or "indeterminate placentation/amnionicity" for a known multiple gestation.

• Ensure the documentation specifies "second trimester" for the inability to determine chorionicity/amnionicity.
• Do not use if the number of fetuses is also unknown; this code requires a specified multiple gestation.
• Sequence this code as a secondary diagnosis following the code for the specific type of multiple gestation (e.g., O30.0- for twin pregnancy).