Overtreatment or Undertreatment: The Association between Diagnosis-Intervention Packet (DIP) Payment Policy and Medical Behavioral Changes based on the Evidence of Doctors' Policy Perceptions

By constructing the analysis framework of "medical insurance policy-doctors' perception - diagnosis and treatment behavior", combined with hierarchical regression analysis method, the questionnaire data of 303 doctors in a tertiary hospital was selected for empirical research. The results showed that the policy understanding, perception of policy importance and policy support of doctors were the core factors affecting their behavior, which played a significant role in cost control, patient screening and admission, coordination with policy and standardization of diagnosis and treatment behavior. Policy clarity and feasibility mainly affect patient screening and admission behavior and coordination with policy, while the perceived fairness of policy has a significant negative impact on coordination with policy and the standardization of medical insurance behavior. It is found that improving policy transparency, strengthening publicity and training, enhancing feasibility and ensuring fairness can effectively promote doctors' behavior adjustment. This study fills the gap of existing research from the policy perception perspective, and provides theoretical and empirical support for optimizing DIP payment policy design.