I am billing for a dme company, primarily WC, if they want to supply to patients of private ins. such as BCBS of texas do they need to be on contract with that carrier or is the w-9 ok for the info they will need for billing on a referral basis. I thought that if the MD is seeing the patient and referrs the patient to our dme for equipment the dr NPI and Lic# as the referrig would be enough. Is that correct? If not, will I need the dme company on contract with all private insurances. Thank you