Maternal care for oth isoimmun, third trimester, fetus 3

This code signifies ongoing specialized maternal care during the third trimester for a pregnancy complicated by isoimmunization, specifically when the condition is not Rh, ABO, or other specified types. It indicates that the fetus, identified as fetus 3 in a multiple gestation, is affected by antibodies produced by the mother's immune system against fetal red blood cell antigens. This maternal antibody production can lead to hemolytic disease of the fetus and newborn.

Apply this code when a pregnant patient in her third trimester is receiving management for isoimmunization other than Rh or ABO, and the specific fetus affected is the third in a multiple gestation. Documentation should clearly state the type of isoimmunization (e.g., Kell, Duffy, Kidd, MNSs, P, Lewis, Lutheran, Diego, Xg, Scianna, Dombrock, Colton, Landsteiner-Wiener, Chido/Rodgers, H, Kx, Gerbich, Cromer, Knops, Indian, Ok, Raph, JMH, I, Globoside, Gill, Sid, or other rare blood group systems), the trimester, and the specific fetus involved.

• Ensure the documentation specifies "other isoimmunization" and not Rh or ABO, as separate codes exist for those.
• Verify the trimester (third) and the specific fetus (fetus 3) are clearly documented for accurate assignment in multiple gestations.
• Sequence this code as a secondary diagnosis following the primary obstetric code indicating the reason for the encounter.