Maternal care for oth rhesus isoimmun, third trimester, oth

This code signifies ongoing maternal medical management and monitoring during the third trimester for a pregnancy complicated by rhesus (Rh) isoimmunization, specifically when the condition is not specified as hydrops fetalis or other specific complications, and it applies to a fetus other than the first or single fetus. This indicates the mother has developed antibodies against the Rh factor, potentially affecting the developing fetus(es).

Use this code when a pregnant patient in her third trimester is receiving care for Rh isoimmunization, and the specific fetal outcome (e.g., hydrops) is not documented, or the isoimmunization is affecting a fetus other than the first or single fetus in a multiple gestation. Documentation should clearly state Rh isoimmunization, third trimester, and mention "other fetus" or a specific fetus in a multiple gestation beyond the first.

• Ensure documentation specifies "third trimester" and "other fetus" for accurate code assignment.
• Distinguish from codes for hydrops fetalis (O36.01-) or other specific complications of Rh isoimmunization.
• This code is for maternal care; separate codes may be needed for fetal conditions or procedures.