Doctors or health care providers who choose to participate in an ACO must display a poster that notifies you of your doctor’s participation in an ACO. It also informs you of your option to decline sharing your health care information by calling 1-800-MEDICARE (1-800-633-4227). TTY users should call 1-877-486-2048.

If you aren’t sure if your doctor or health care provider is participating in a Medicare ACO, ask him or her during your visit. For general information on ACOs, call 1-800-MEDICARE (1-800-633-4227).