Maternal care for anti-D antibodies, unsp trimester, fetus 3

This code signifies specialized maternal care provided due to the presence of anti-D (Rh) antibodies in the mother's blood, specifically when the gestational trimester is not documented, and the pregnancy involves a third fetus. This condition can lead to hemolytic disease of the fetus and newborn (HDFN) if the fetus is Rh-positive.

Apply this code when a pregnant patient with anti-D antibodies receives monitoring or treatment, and the medical record does not specify the trimester. Documentation should clearly indicate the presence of anti-D antibodies, the maternal care provided, and that this is the third fetus in a multiple gestation.

• Ensure documentation explicitly states "fetus 3" for multiple gestations; otherwise, use codes for single gestation or unspecified fetus.
• Do not use this code if the trimester is clearly documented; instead, select the appropriate trimester-specific code.
• This code is for the maternal care due to the antibodies, not for the antibodies themselves (which would be coded separately, e.g., from Chapter 28).