Maternal care for oth isoimmun, unsp trimester, fetus 3

This code signifies maternal care provided due to isoimmunization, a condition where the mother's immune system produces antibodies against fetal red blood cell antigens, other than Rh incompatibility. This specific code is used when the trimester of gestation is not documented and refers to the third fetus in a multiple gestation.

This code is appropriate when a pregnant patient receives care for isoimmunization (e.g., Kell, Duffy, Kidd, or other minor blood group incompatibilities) that is not specified as Rh isoimmunization. It should be used when the medical record does not indicate the trimester and the patient is carrying triplets or more, and this code specifically refers to the third fetus. Documentation should clearly state the type of isoimmunization (if known and not Rh) and the fetal order.

• Ensure the documentation explicitly states "other isoimmunization" or specifies a non-Rh type.
• Verify that the trimester is truly unspecified in the medical record before using this code.
• This code is for the third fetus; use O36.191- for the first fetus and O36.192- for the second fetus in multiple gestations.