EHR play an important role in the health care system, so the issue of data efficiency is key in the development of the EHR system. One of the key benefits of EHR is an access to medical information anywhere, anytime. While testing this advantage, it was found that it is performed only privately and does not take into account the dynamics of patients. Therefore, a model for calculating the efficiency of EHR on the basis of full coverage was developed. The study presents a model of the “Element” system, which provides for maximization of the coverage ratio of EHR to provide providers with access to medical records in the form required. The Element system is based on medical information packaging methods such as the dictionary method, the direct matching method and the combined method, and also allows healthcare professionals to be available to users’ medical information in this regard when EHR with customer data arises from EHR medical fund. In this case, if the presented system can be reduced both the time of work with medical documents and the time required for the appointment of drugs, which, accordingly, reduces the time to receive medical care. A set-theoretical model of the information system for improving the quality of medical services is proposed. The study of this model showed the need to measure the effectiveness of medical systems, taking into account their coverage. Medstar, Medkit and Helsi systems, which are part of the eHealth system, were used for the analysis. During the study, such concepts as full and partial coverage of systems were identified, the disadvantages of partial coverage were indicated. It has been found that for maximum efficiency it is necessary to minimize the time required to access medical information, which is achieved through full coverage.
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