With the continuous deepening of medical insurance payment-mode reform, the average length of hospitalization in public hospitals has been shortened significantly, and a large number of rehabilitation and follow-up treatment services have been transferred to the community and home settings. Online doctor-patient interaction has gradually transformed from a supplementary service to an important guarantee for continuous post-discharge health management, the reduction of unplanned readmissions, and the improvement of medical care quality. In order to realize the continuity of post-discharge care, many public hospitals have built “Internet-plus” medical service channels represented by Internet hospitals and Enterprise WeChat to carry out online asynchronous or real-time text communication between doctors and patients. However, obvious group-level differences exist in clinicians’ willingness to participate, response quality, and adherence to work in online services, which have become a bottleneck restricting the standardized promotion of online follow-up management. From the perspective of group heterogeneity and organizational behavior, this paper takes the cross-system operation data from January to December 2025 as the research sample and empirically analyzes the heterogeneous characteristics of clinicians’ online doctor-patient interaction behaviors based on their occupational attributes. The findings can provide a decision-making reference for hospitals to formulate differentiated incentive strategies and optimize the long-term operation mechanism of post-discharge online continuous care.