Fetomaternal placental transfusion syndrome, third trimester

This code signifies a condition in the third trimester of pregnancy where there is an abnormal transfer of blood from the fetus to the mother (feto-maternal hemorrhage) or from one twin to another (twin-to-twin transfusion syndrome) via the placenta. This can lead to fetal anemia and hydrops in the donor twin, or polycythemia and hypervolemia in the recipient twin, or maternal sensitization.

Use this code when documentation explicitly states fetomaternal placental transfusion syndrome occurring in the third trimester. This diagnosis is typically made through ultrasound findings (e.g., fetal anemia, hydrops, polyhydramnios, oligohydramnios) and confirmed by laboratory tests (e.g., Kleihauer-Betke test for feto-maternal hemorrhage).

• Ensure the documentation specifies "third trimester" for accurate code assignment.
• Distinguish between fetomaternal transfusion and twin-to-twin transfusion syndrome, as specific codes exist for each.
• Code any associated fetal complications (e.g., fetal anemia, hydrops) or maternal complications separately.