Maternal care for oth rhesus isoimmun, third trimester, unsp

This code signifies maternal care for a pregnant patient experiencing rhesus isoimmunization during the third trimester, where the specific type of isoimmunization is not specified or is other than Rh 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.

Use this code when documentation indicates maternal care for rhesus isoimmunization in the third trimester, and the specific type of isoimmunization is not explicitly stated as Rh incompatibility or is identified as another form of rhesus isoimmunization. This applies when the documentation does not specify the applicability of the condition (e.g., whether it's affecting the fetus).

• Ensure the documentation clearly states "third trimester" and "rhesus isoimmunization" without specifying Rh incompatibility.
• Do not use this code if the documentation explicitly states Rh incompatibility; use the appropriate O36.01- code instead.
• Consider sequencing this code as a secondary diagnosis if the primary reason for the encounter is a complication directly related to the isoimmunization.