I do Mental Health billing for providers in AZ, PA, IL, NY. I recently acquired a provider in CA. I charge 7% of revenue received, that includes insurance verification, tracking auths and any extraneous paperwork, such as sending w-9 forms, updating addresses, even assisting with credentialing. The CA fees for out of network providers is much, much higher than in other areas. Is anyone on this list who is in CA and who knows what the 'going rate' is for MH billing in the LA area?