CMS' controversial proposed demonstration aimed at bringing down Part B drug costs is unlikely to count as an alternative pay model in the agency's revamp of the physician-pay system, health policy experts say. Also, rheumatologists argue that factoring in the Part B demonstration would distort physician comparisons in the Merit-Based Incentive Payment System, which will also be part of the new physician-pay scheme. The agency is writing separate regulations for the physician pay system and the Part B drug-pay demonstration,...