Bariatric surgery results in significant and sustained weight loss, improvements in obesity-related comorbid conditions and increased quality of life. There are limited data on health care costs of patients who undergo bariatric surgery in CAN. The study objective is to examine the impact of bariatric surgery, specifically laparoscopic sleeve gastrectomy (LSG) on the health care costs of patients over a multi-year period. Methods: This is a longitudinal analysis (2008-2017) of health care costs associated with hospitalization admissions, outpatient or surgical day care and physician visits for 201 patients enrolled in the Newfoundland and Labrador Bariatric Surgery Cohort Study. Using data linkage methods, the clinical data of study participants was merged via a health insurance number with several administrative health care data sets. Differences in health care usage and costs were examined three years pre and three years post-surgery. Results: The sample(n=201) was female(81.6%) with an average age of 43.8 years and average BMI of 48.3kg/m2 , respectively. Percent excess weight loss(% EWL) was 52.6% at 24 months. Close to half had dyslipidemia(47.9%), hypertension(47.9%) and diabetes(41.8%). Total health care costs associated with hospital admissions, surgical day care use and visits to a physician increased by 33%, three years post-surgery ,driven by an increased use of surgical day care services after surgery. Compared to pre-surgery, reasons for health care use post-surgery changed and are reflective of patient’s health status.