Impacts of adjustment of National Reimbursement Drug List on orphan drugs volume and spending in China: an interrupted time series analysis

ObjectiveTo evaluate the impacts of the 2017 adjustment of National Reimbursement Drug List (NRDL) on orphan drugs hospital procurement volumes and spending in China.DesignWe used an interrupted time series design covering the period from 2016 to 2018 to analyse changes in hospital procurement volumes and spending of orphan drugs for which were included in the 2017 NRDL.Setting and dataThe study was conducted in China. Orphan drug procurement data of 789 public hospitals (594 tertiary hospitals and 195 secondary hospitals) were derived from the Chinese Medical Economic Information (CMEI).Outcome measuresMonthly orphan drugs hospital procurement volumes and spending.ResultsNine orphan drugs were included in the 2017 NRDL (seven were directly included, and two were included after price negotiation). Comparing to orphan drugs not included in the NRDL, hospital procurement volumes (β7 =43 312, p