Maternal care for oth rhesus isoimmun, second tri, unsp

This code signifies antenatal care provided to a pregnant patient in her second trimester due to the presence of rhesus isoimmunization, where the specific type of isoimmunization is not further specified or is considered "not applicable." This condition arises when an Rh-negative mother is exposed to Rh-positive fetal blood, leading to the production of antibodies that can affect subsequent Rh-positive pregnancies.

Apply this code when documentation indicates maternal care for rhesus isoimmunization during the second trimester, and the specific type of isoimmunization is not detailed (e.g., anti-D, anti-C, anti-E). This code is appropriate when the medical record clearly states "rhesus isoimmunization" without further specificity, or when the documentation explicitly uses "not applicable or unspecified" in relation to the type.

• Ensure the documentation clearly specifies "second trimester" for accurate trimester assignment.
• Avoid using this code if a more specific type of rhesus isoimmunization (e.g., anti-D) is documented; instead, use the appropriate specific code.
• This code is for the maternal condition; codes for fetal conditions related to isoimmunization (e.g., hydrops fetalis) should be coded separately.