Maternal care for oth isoimmun, second trimester, fetus 1

This code signifies specialized prenatal care provided to a pregnant patient in her second trimester due to the presence of isoimmunization affecting fetus 1, other than Rh or ABO incompatibility. This condition arises when the mother's immune system produces antibodies against fetal red blood cell antigens, potentially leading to hemolytic disease of the fetus and newborn.

Apply this code when documentation confirms maternal isoimmunization (e.g., anti-Kell, anti-Duffy, anti-Kidd antibodies) requiring monitoring or intervention during the second trimester for the first identified fetus. This typically involves serial antibody titers, fetal ultrasound surveillance for hydrops, or other specialized fetal assessments.

• Ensure the specific type of isoimmunization is documented and is not Rh or ABO.
• Verify the gestational trimester and the specific fetus (if multiple gestations) are clearly stated in the medical record.
• Do not use this code for routine prenatal care without documented isoimmunization.