Medicare is a federal program that pays for certain health care expenses for individuals who are age 65 or older and individuals with end stage kidney disease or total disability. It is entirely a federal program and is overseen by the Centers for Medicare & Medicaid Services (CMS). Hospitals that serve as Medicare providers must adhere to various rules and regulations for patient care and reimbursement. The Oklahoma Hospital Association monitors prospective and recently implemented changes to Medicare, provides information about how specific aspects of the plan affect care providers, and advocates for fair and equitable implementation of the program.