Maternal care for anti-D antibodies, second tri, fetus 1

This code signifies a pregnant patient in her second trimester who is receiving medical management due to the presence of anti-D (Rh) antibodies. This condition indicates that the mother's immune system has developed antibodies against the Rh factor, which could potentially affect the Rh-positive fetus. The "fetus 1" designation specifies that this care pertains to the first fetus in a multiple gestation or the only fetus in a singleton pregnancy.

Use this code when documentation confirms a pregnant patient in her second trimester is receiving care for Rh isoimmunization, specifically due to anti-D antibodies. This typically involves monitoring the mother's antibody titers and the fetus for signs of hemolytic disease. Supporting documentation would include laboratory results confirming anti-D antibodies and physician notes detailing the management plan.

• Ensure the documentation clearly specifies "second trimester" for accurate trimester assignment.
• Verify that the antibodies are specifically anti-D (Rh) and not other types of antibodies, as different codes exist for other isoimmunizations.
• Confirm "fetus 1" is the correct designation; use O36.0122 for fetus 2, O36.0123 for fetus 3, etc., in multiple gestations.