Objective: With the popularity of the Internet in recent years, hospital accreditation in Taiwan specifies that a portal website on health education be made available to the public. Thus, there is a need to study the visibility of portal websites for hospitals in Taiwan.Methods: Five hundred thirteen hospital portal websites were compared. Seventy-five keywords (as items) and 273 hospitals (as examinees) were fitted to the Rasch model (1960) after a serial Rasch analysis was performed. The extremely worldwide popular search engine, Google, incorporated with a computer program to facilitate searching efficiency was used in the present study. After＞54,891 web page searches, a Likert-type 0-9 score was analyzed to estimate the visibility of each hospital portal website.Results: There were 75 items and 275 hospitals that fit to the Rasch model expectation. The most difficult items to search on hospital websites were types of registered clinical professionals, followed by hospital beds and departments. The differences in visibility were substantially significant (p＜.05) in paired comparisons between types of hospitals based on the following hierarchy using ANOVA one-way variance analysis: medical centers＞region hospitals＞local hospitals.Conclusions: We suggest that hospital managers focus not only on website content, but on information architecture and meta-data to increase the visibility of a hospital portal website. The government section in charge of healthcare could develop an official website search engine to facilitate hospital accreditation based wholly on assessing the performance of website visibility.