Evaluation of the effect of DRG payment policy based on interrupted time series modeling: evidence from a tertiary hospital in Anhui Province

The findings show that the DRG reform has positively impacted hospital functioning, including quality, safety, efficiency and costs. Although the average length of stay remained unchanged, there was an increase in discharged patients and outpatient visits, indicating hospitals adapted to the new payment model. The reduction in low-risk group mortality suggests improvements in patient safety and care quality. However, challenges remain, as evidenced by decreased surgical complexity and initial drops in bed turnover rates. While the DRG reform holds promise for enhancing healthcare efficiency and controlling costs, potential negative effects such as patient selection bias and coding changes need to be monitored. Future research should focus on the long-term effects of the DRG policy across different healthcare institutions.