Digital healthcare has been contributing considerable merits to the public health system, especially during the Covid-19 pandemic. Within a digital healthcare system, the role of information communication through the Internet is crucial. The current study explores how patients’ accessibility and trust in the Internet information influence their decisions and ex-post assessment of healthcare providers by employing the Bayesian Mindsponge Framework (BMF) on the dataset of 1,459 Vietnamese patients. We find that patients’ accessibility to Internet information positively affects the perceived sufficiency of information for choosing a healthcare provider, and their trust in the information intensifies this effect. Nevertheless, being more accessible to Internet information is negatively associated with the post-treatment negative feeling about healthcare providers, and trust also moderates this effect. Moreover, patients considering professional reputation important while making a decision are more likely to regard their choices optimal, whereas patients considering services important have contradicting tendencies. Based on these findings, a concern about the risk of eroding trust toward Internet sources about healthcare information is raised. Thus, quality control and public trust-building measures need to be taken to improve communication effectiveness through the Internet and eventually facilitate the adoption of the digital health system.