I have recently started working part-time mental health & substance abuse counseling center as a medical biller. I have done medical billing for 4 years but mainly for Family Medicine & Internal Medicine so some of this is new to me. Is there anything I sould be aware of that is different when billing for mental health & substance abuse? I notice that most carriers have different benefits, customer service numbers, and claims address for MH/SA. The person that did the billing before I did left the position suddenly and she was not organized. I have had to train myself on the process here. They do not have a medical management system so I have to build a database just so I have the info I need for billing. They basicly file all claims by logging into the carriers website and completing claims. I will gladly accept any advice.