MAC with Exclusive Jurisdiction over a Medicare Item or

90.4.1 – MAC with Exclusive Jurisdiction over a Medicare Item or Service (Rev. 120, Issued: 01-16-15, Effective: 01-01-15, Implementation: 01-01-15) In some instances, one Medicare A/B MAC processes all of the claims for a particular Medicare-covered item or service for all Medicare beneficiaries around the country. This generally occurs when there is only one provider of a particular item or service (for example, certain pathology and lab tests furnished by independent laboratories). In this situation, MA plans must follow the coverage policy reflected in an LCD issued by the A/B MAC that enrolled the provider and processes all of the Medicare claims for that item or service.