Maternal care for oth rhesus isoimmun, third tri, fetus 3

This code signifies ongoing specialized medical management for a pregnant patient in her third trimester who has developed an immune response against the red blood cells of her third fetus due to Rh incompatibility. This isoimmunization can lead to hemolytic disease of the fetus and newborn (HDFN), requiring close monitoring and potential interventions to protect the fetus.

Use this code when a pregnant patient with Rh-negative blood has developed antibodies against the Rh-positive red blood cells of her third fetus, and she is currently in her third trimester. Documentation should clearly indicate Rh isoimmunization, the specific fetus affected (third), and the gestational trimester.

• Ensure documentation specifies "fetus 3" to differentiate from other fetuses in multifetal pregnancies.
• Confirm the patient is in her third trimester (28 weeks gestation to delivery).
• Do not confuse with codes for ABO isoimmunization or other types of maternal isoimmunization.