Hi, I have a situation. A subcontractor is billing us for:
86006 Antibody, non-RBC, qualitative; first antigen, slide or tube
and insisting it is a valid code.

The relationship between our agencies is a bit weird, but I am not seeing it anywhere. I wonder if someone with more experience could tell me when this code was phased out, and what additional information I might need to be asking this contractor regarding what services they actually performed.