You would use modifier 59 when you have more than one DIFFERENT lab test but they use the same CPT code, or if you have the same lab test with different types of specimens, such as serum and the same test on a body fluid where there is not a different code available for each of them. You would place modifier 59 on the additional tests not on the first. I use to work as a Medical Technologist and also have done lab billing for many years. I hope this helps.
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