Encounter for antenatal screening for isoimmunization

This code signifies an encounter for routine antenatal screening to detect the presence of maternal antibodies that could potentially cross the placenta and cause hemolytic disease in the fetus or newborn (isoimmunization). This screening typically involves blood tests to identify atypical antibodies or assess for Rh incompatibility.

Use this code for pregnant patients undergoing routine prenatal laboratory testing specifically aimed at identifying isoimmunization risk, such as an indirect Coombs test or Rh antibody screen. It is appropriate for initial screening and follow-up screenings during an uncomplicated pregnancy where no isoimmunization has been confirmed.

• Do not use this code if isoimmunization has already been diagnosed; instead, code for the specific condition (e.g., O36.0- for maternal care for Rh isoimmunization).
• This code is for the encounter for screening, not for the results of the screening.
• Pair this code with other relevant codes for the encounter, such as the trimester of pregnancy (e.g., Z3A.00-).