Commercial entities that could serve as vendors between manufacturers and providers are a key part of the Trump administration’s proposed Medicare Part B demo, but it is still unclear which, if any, will decide to participate in CMS’ competitive selection process. The administration listed potential vendors as specialty pharmacies, group purchasing organizations, pharmacy benefit managers, distributors, manufacturers and providers in its advance notice of proposed rulemaking announcing the demo. But a lack of detail about reimbursement has left some entities...