With therapists there are very few codes. Personally I would just go over it with the therapist initially stating that I would go by the time indicated on the notes to determine if it's a 90804, 90806 or 90808. ALso, I would just verify that they do a 90801 on the first session with a patient. Then you would not need to be a certified coder. You are actually not coding it, you are following guidelines from the therapist and using the codes that they want used based on their notes. DMK is correct, it is the therapist's responsibility so as long as they make it clear to you how they want it coded based on their notes, that would be fine.