Maternal care for oth rhesus isoimmun, first tri, fetus 3

This code signifies specialized maternal care provided due to the mother having antibodies against fetal red blood cells, specifically in cases of rhesus isoimmunization that are not ABO incompatibility. This condition occurs when a Rh-negative mother is exposed to Rh-positive fetal blood, leading to the production of antibodies that can cross the placenta and affect the fetus. This particular code specifies the care is for the third fetus during the first trimester of pregnancy.

Use this code when documentation indicates a pregnant patient is receiving medical management or monitoring for rhesus isoimmunization, and it is explicitly stated that this is the third fetus and the encounter occurs during the first trimester. Supporting documentation would include serology results confirming Rh isoimmunization, a clear indication of the current pregnancy's fetal number, and the gestational age.

• Ensure the documentation clearly specifies "other rhesus isoimmunization" to differentiate from ABO incompatibility.
• Verify the fetal number (third fetus) and the trimester (first trimester) are accurately documented.
• This code is for maternal care; do not use for fetal conditions or procedures.