Maternal care for anti-D antibodies, third trimester, oth

This code signifies ongoing maternal medical management during the third trimester of pregnancy due to the presence of anti-D (Rh) antibodies, specifically when the antibodies are affecting a fetus other than the first one. This condition arises when an Rh-negative mother is sensitized to Rh-positive fetal blood, leading to the production of antibodies that can cross the placenta and cause hemolytic disease in subsequent Rh-positive fetuses.

Use this code for a pregnant patient in her third trimester who is receiving care for Rh isoimmunization, and the documentation specifies that the affected fetus is not the primary one (e.g., in a multiple gestation pregnancy). Documentation should clearly indicate the presence of anti-D antibodies and the gestational stage.

• Ensure documentation specifies "third trimester" and "other fetus" to support this specific code.
• Do not confuse with codes for Rh incompatibility without antibody formation or for care in earlier trimesters.
• Always sequence this code as a secondary diagnosis, with a code from category O09 (Supervision of high-risk pregnancy) as the primary diagnosis.