Fetus-to-fetus placntl transfuse syndrome, second trimester

This code identifies twin-to-twin transfusion syndrome (TTTS) occurring in the second trimester of pregnancy. TTTS is a serious complication of monochorionic multiple gestations where abnormal vascular connections in the shared placenta lead to an imbalanced blood flow between the fetuses, resulting in one "donor" twin and one "recipient" twin.

Assign this code when documentation confirms a diagnosis of twin-to-twin transfusion syndrome in a pregnancy that is currently in its second trimester (weeks 13 through 27). Supporting documentation would include ultrasound reports detailing discordant fetal growth, amniotic fluid levels, and Doppler studies, along with the physician's diagnostic statement.

• Ensure the documentation explicitly states the diagnosis of twin-to-twin transfusion syndrome and the gestational trimester.
• Do not confuse this with other placental complications or other types of multiple gestation complications.
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if another condition is the primary reason for the encounter but TTTS is also being managed.