Outpatient services are one of the key indicators of hospital service quality. Patient satisfaction is influenced by various factors, including service determinant factors and waiting time. This study aimed to analyze the effect of Service Determinant Factors on Waiting Time, the effects of Service Determinant Factors and Waiting Time on Patient Satisfaction, and the mediating role of Waiting Time in outpatient services at Kardinah Regional General Hospital (RSUD Kardinah), Tegal. This study employed a quantitative, explanatory research approach. The sample consisted of 152 outpatients selected through purposive sampling. Data were collected via a Likert-scale questionnaire and analyzed using Jamovi, including descriptive analysis, classical assumption tests, linear regression, and mediation analysis. The results showed that Service Determinant Factors, Waiting Time, and Patient Satisfaction were all categorized as good. Service Determinant Factors had no significant effect on Waiting Time (p = 0.361), but had a positive and significant effect on Patient Satisfaction (β = 0.374; p < 0.001). Waiting Time also had a positive and significant effect on Patient Satisfaction (β = 0.184; p = 0.024). Furthermore, mediation analysis indicated that Waiting Time did not mediate the relationship between Service Determinant Factors and Patient Satisfaction because the effect of Service Determinant Factors on Waiting Time was not statistically significant. Outpatient satisfaction at Kardinah Regional General Hospital (RSUD Kardinah) in Tegal is influenced more directly by service quality than by waiting time. Therefore, efforts to improve service quality should prioritize enhancing service processes, the efficiency of the registration system, healthcare professionals' performance, and facility comfort, while continuously optimizing waiting-time management to improve patient satisfaction.
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