Description: Obesity rates in the United States have climbed to historic highs, with nearly 42% of adults now classified as obese—a trend with significant implications for the health care system. Among Medicare-aged individuals, obesity is strongly associated with chronic conditions such as diabetes, cardiovascular disease and musculoskeletal disorders, all of which increase health care utilization and spending. As costs continue to rise, understanding the financial impact of obesity management is increasingly important for policymakers, payers and providers. This analysis uses detailed traditional Medicare claims and eligibility data to examine how obesity levels relate to health care expenditures and how costs change as members move between different diagnosed obesity categories over time