Billing for Arizona Medicaid for Substance Use IOP. I understand updating treatment planning, but in doing the treatment planning, would your counselors do an assessment or an individual therapy session to update it?

My other thoughts lean to IOP being per diem. If they do IOP class and then an individual session on the same day, the session used to do a treatment update would be included in the H0015 code? I am new and I do not have a boss.. I am the only coder/biller/credentialing/contract person in the office. Thanks for any help or input!