Maternal care for anti-D antibodies, second tri, fetus 3

This code signifies ongoing maternal care during the second trimester of pregnancy due to the presence of anti-D (Rh) antibodies, specifically impacting the third fetus in a multiple gestation. This condition indicates potential Rh incompatibility, where the mother's immune system has developed antibodies against the Rh-positive red blood cells of the fetus. Such antibodies can cross the placenta and cause hemolytic disease of the fetus and newborn (HDFN).

Assign this code when a pregnant patient in her second trimester is receiving management for anti-D antibodies, and the documentation clearly identifies the affected fetus as the third in a multiple gestation. This typically involves monitoring antibody titers, fetal well-being, and potentially planning for interventions like intrauterine transfusions or early delivery. Documentation should specify the trimester, the presence of anti-D antibodies, and the specific fetus affected in a multifetal pregnancy.

• Ensure the documentation explicitly states "second trimester" and identifies the "third fetus" for accurate assignment.
• Do not confuse this with codes for other types of maternal antibodies or for Rh incompatibility affecting a different fetus in a multiple gestation.
• Always sequence this code as a secondary diagnosis following the primary code for the current pregnancy (e.g., Z3A.xx for weeks of gestation).