Computer systems have been proven to improve the performance of the organization. The influence of information technology (IT) also has impacted the way firms do business, not only improving process efficiency, but also data analyses, decision-making, customer acquisition and retention which lead to the improvement of organization sustainability. However, the implementation of new technology is not easy. Various studies have shown failure in the technology implementation. Based on Technology Acceptance Model (TAM), the quality of the system, which consists of perceived usefulness (POU) and perceived ease of use (PEOU), has been understood to influence customer satisfaction. However, there are still few studies that link system quality and customer loyalty. This study aimed to see the influence of system quality on customer loyalty. Using a descriptive quantitative method, this study was conducted on BPJS Kesehatan (Universal Health Coverage Program in Indonesia) members at 19 public and private hospitals in nine cities in Java, Indonesia. A six-point Likert scale questionnaire was designed and distributed. Four hundred and six samples collected were eligible for analysis using descriptive analysis and structural equation modelling with LISREL. The results show there is a positive relationship between system quality and customer loyalty. This study strengthens the body of evidence which showed the influence of POU and PEOU on customer loyalty.