For a blood transfusion performed on a 2-day-old infant weighing 3 kg, what code should be reported?

The appropriate code for a blood transfusion performed on a 2-day-old infant weighing 3 kg is 36430-63. This code specifically represents the procedure of the transfusion of blood components, which is relevant for this scenario involving an infant.

The "-63" modifier indicates that the service is being performed on a patient with a unique circumstance, in this case, a neonate, which typically necessitates special consideration in coding. Blood transfusions for neonates often have their own coding parameters due to their specific medical needs, and using the right modifier ensures accurate representation of the service provided.

The other options relate to different procedures or conditions that do not apply to blood transfusions. Therefore, in coding for the transfusion in this specific patient population, 36430-63 is the correct code to report.