An ACO involves a group of health care providers such as doctors, hospitals, health plans, and other healthcare constituents, who voluntarily come together to provide quality, coordinated care to populations of patients. If you have Original Medicare and your doctor, hospital, or health care provider decides to coordinate with other health care providers through an ACO, you’ll benefit because they’ll work together to get you the right care, at the right time, in the right setting. An ACO isn’t the same as a Medicare Advantage Plan or Health Maintenance Organization (HMO). You’re still in Original Medicare, and your Medicare benefits, services, rights, and protections won’t change. And you still have the right to use any doctor or hospital that accepts Medicare at any time, the same way you do now.