We have a clinical social worker that would like to start billing for her services. She would like to use codes 90846, 90847, 90849, and 90853. I cannot find anything though that tells me what documenation is required, if they are billed in units, and then if a social worker is even permitted to bill these codes. Most of these will go to Medicare for payment, which looks like the reimbursement is great but I just want to make sure that we are documenting and coding correctly. Any help/guidance is appreciated. Thanks!