Oth mult gest, unab to dtrm num plcnta & amnio sacs, 3rd tri

This code signifies a multifetal pregnancy where the specific type of multiple gestation (e.g., dichorionic/diamniotic, monochorionic/diamniotic) cannot be definitively determined due to insufficient information regarding the number of placentas and amniotic sacs. This uncertainty persists into the third trimester of pregnancy.

Apply this code when documentation clearly indicates a multiple gestation in the third trimester, but imaging or clinical notes do not specify the chorionicity or amnionicity. This often occurs when initial scans were inconclusive or not performed, and subsequent attempts to determine these factors have been unsuccessful.

• Ensure the documentation explicitly states "unable to determine number of placentas and amniotic sacs" for a multiple gestation.
• Confirm the gestational age is within the third trimester (28 weeks 0 days to 40 weeks 6 days).
• Do not use if chorionicity and amnionicity are known, even if not explicitly stated in the code description.