Lantheus Holdings LNTH shares fell Wednesday after U.S. health agencies proposed changes to Medicare payment rules for hospital outpatient services and surgical centers starting in 2026.The proposal outlines changes in how payment rates are calculated for services under the Hospital Outpatient Prospective Payment System (OPPS) and the ASC payment system.The CMS has proposed maintaining the $140 packaging threshold for drugs, biologicals, and therapeutic radiopharmaceuticals for calendar year (CY) 2026 under ...