Jurisdiction Of Referral Laboratory Services

50.5.1 - Jurisdiction Of Referral Laboratory Services (Rev. 85, 02-06-04) Regardless of whether the laboratory that bills Medicare is the referring or reference laboratory, the laboratory that does the billing may bill only the A/B MAC (B) that services the jurisdiction in which the billing laboratory is physically located. The location of the draw station, when a separate draw station is employed, never determines claims filing jurisdiction.