Maternal care for anti-D antibodies, first tri, fetus 4

This code signifies a pregnant patient in her first trimester receiving medical attention due to the presence of anti-D (Rh) antibodies, specifically when the fourth fetus is affected. This indicates an Rh-negative mother who has developed antibodies against the Rh factor, posing a risk to an Rh-positive fetus.

Apply this code when documentation confirms maternal care for Rh isoimmunization in the first trimester, and the medical record explicitly identifies this as the fourth pregnancy with an affected fetus. This typically involves monitoring antibody titers and planning for potential interventions. Supporting documentation includes laboratory results showing anti-D antibodies and obstetric notes detailing the pregnancy number and trimester.

• Ensure the medical record clearly specifies "first trimester" and "fourth fetus" to accurately assign this code.
• Do not confuse this with codes for other types of maternal antibodies or different trimesters/fetus numbers.
• Sequence this code as a primary diagnosis when the anti-D antibodies are the primary reason for the encounter.