To promote the coordinated development and governance between China's healthcare and medical insurance systems, this paper constructs an order parameter indicator system for the two systems based on the synergetics theory. Adopting a cross-system analysis method, it establishes a measurement model for the healthcare-medical insurance integrated system, and calculates the order degrees of the healthcare system and the medical insurance system, as well as the synergy degree of the compound system from 2003 to 2023. The results indicate that the development of China's healthcare and medical insurance systems developed largely in isolation during this period, with the synergy degree fluctuating at a persistently low level ranging from -0.097 to 0.099, showing a significant scissors gap (asymmetric) evolution characteristic. This paper suggests establishing mechanisms for sharing high-quality healthcare resources based on integrated delivery systems (IDS), while using differentiated performance assessments to mitigate the siphoning effect of large hospitals. Furthermore, it is necessary to further reform the medical insurance payment systems toward a diversified, integrated model featuring DRG/DIP, consolidate the global budget and surplus retention mechanism, while deeply aligning them with the hierarchical medical system. Furthermore, it is vital to establish a regular cross-departmental coordination mechanism for collaboration among healthcare, medical insurance and pharmaceuticals with a foundational data-sharing platform. The synergy degree of the integrated system should be incorporated into a routine monitoring framework to build a dynamically adaptive closed-loop governance system.