I need help. I have antibody testing that needs to be billed out but not sure exactly what codes to bill out for IgM, IgG, and IgA test. Do I bill out 3 codes for each one of them? Is it one code? I have found that 86769 is the antibody testing code. Just not sure if I need to bill it out 3 times or just once. Please help me! I’m lost.