Maternal care for oth rhesus isoimmun, third tri, fetus 5

This code signifies specialized maternal care provided during the third trimester of pregnancy due to the mother's immune system producing antibodies against fetal red blood cells, specifically in cases of Rh incompatibility other than D antigen. This condition, known as rhesus isoimmunization, can lead to hemolytic disease of the fetus or newborn (HDFN) in the fifth fetus.

Assign this code when a pregnant patient in her third trimester is receiving management for Rh isoimmunization, and the specific Rh antigen involved is not Rh D. Documentation should clearly indicate the "other" Rh isoimmunization, the gestational trimester, and that this is the fifth pregnancy affected by this condition.

• Ensure documentation specifies "other rhesus isoimmunization" and not Rh D isoimmunization.
• Verify the trimester of pregnancy and the parity (fifth fetus) are clearly documented.
• Do not use this code for Rh D isoimmunization; refer to the O36.01- series for those cases.