The objective of this paper is to find out what factors influence outpatient satisfaction in private hospitals in the Klang Valley. This study employs the SERVQUAL model to determine which factors have the greatest impact on patient satisfaction in Klang Valley private hospitals. The tangibles are dependability, responsiveness, assurance, and empathy. The SERVQUAL dimensions investigated in this study are tangibles, dependability, responsiveness, assurance, and empathy. These factors are thought to be well researched in terms of influencing outpatient satisfaction, but they can still influence patient satisfaction in private hospitals in the Klang Valley. The sample of 414 was successfully collected and further analysed using SPSS. The overall SERVQUAL model can predict outpatient satisfaction, according to the findings, with the responsiveness dimension being the most powerful predictor for private hospitals in Klang. This research also contributes to the UNDP’s-SDG efforts to reduce by one third premature mortality from non-communicable diseases through prevention and treatment and to promote mental health and well-being by 2030.