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.