In Government hospitals, some of which are among the best hospitals in Tamilnadu, provide treatment at taxpayer expense. Government hospitals provide treatment either free or at minimal charges. But Hospital treatment costs in these hospitals depend on financial condition of the patient and facilities utilized by him but are usually much less than the private sector. For instance, a patient is waived full treatment costs if he is below poverty line. Another patient may seek for an air conditioned room, if he is willing to pay extra for it. The charges for basic inhospital treatment and investigations are much less in public hospitals as compared to the private hospitals. Healthcare sector of a country needs special attentions from the government as quality of healthcare provides hope and relief to the patients and their dependents. The objective of this study is to compare the quality of health care services delivered by the public and private hospitals to gain patient satisfaction in Pakistan. Five service quality dimensions; empathy, tangibles, assurance, timeliness and assurance were used in order to measure the patient’s perceptions about the service quality of public and private hospitals in TamilNadu. Due to the nature of this study only those respondents were included in the study having perceptions about both the hospitals. This study is taking of data mining techniques using Apriori Algorithm. Results showed that private hospitals are delivering better quality of services to their patients as compared to public hospitals.