Which of the following provides Medicare supplement policies?

Medicare supplement policies, also known as Medigap, are specifically designed to help cover some of the costs that Original Medicare does not, such as deductibles, copayments, and coinsurance. These policies are offered by private insurance companies. This allows individuals to choose from a range of plans that can best suit their healthcare needs and financial situation. Each private insurer may offer different pricing and benefits under these standardized plans.

In contrast, government agencies primarily administer Medicare but do not provide supplement policies, while non-profit organizations may offer services and information about Medicare but they do not issue Medigap insurance. Likewise, employer-sponsored plans are typically separate from Medicare and serve different purposes, primarily providing health coverage through an employer. Therefore, private insurance companies are the correct providers of Medicare supplement policies, reflecting their role in the healthcare insurance market.