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Reference Lab Billing-Admission Source

Best answers
I bill for an OON hospital facility. We just contracted with a reference lab to perform billing for out patient lab services. Lab billing is completely new to me and I'd greatly appreciate any help I can get. I am currently having doubts about the admission source. What admission source code should be used when billing these lab services (141 TOB)? Also, do we need physician referrals to get reimbursement?
Please help. Thank you.