ONECare is a Health Maintenance Organization that contracts with the federal government to provide Medicare services and benefits to individuals that are eligible for both Medicaid (AHCCCS) and Medicare that reside in the Maricopa County and Pima County service area in Arizona.

The information presented on this site is meant to provide detailed information related to ONECare benefits and services. Please use the links along the top navigation bar of this website to locate specific topics. If at any time you cannot find the information that you are looking for, or need to talk to a ONECare representative for help, please feel free to contact us.

Please call 602-778-8345 or 1-877-778-1855.
From October 1 through February 14, Member Services representatives will be available to answer your call from 8 a.m. to 8 p.m., seven days a week, except Thanksgiving and Christmas. From February 15 through September 30, Member Services representatives will be available to answer your call from 8 a.m. to 8 p.m., Monday through Friday, except holidays.
(TTY users should call 711)

Click here to be linked to the CMS website for more information on Medicare

Click on the following links for information related to your rights and responsibilities upon disenrollment from ONECare.

All Medicare Advantage and Medicare Prescription Drug Plans agree to stay in the program for a full year at a time. Each year, the plans decide whether to continue for another year. Even if a Medicare Advantage or Medicare Prescription Drug Plan leaves the program, you will not lose Medicare coverage. If a plan decides not to continue, it must send you a letter at least 90 days before your coverage will end. The letter will explain your options for Medicare coverage in your area.

You may submit feedback about your Medicare Advantage health plan directly to Medicare. By clicking on this link you will be leaving the ONECare Health Plan website and will be directed to the CMS Model Electronic Complaint Form. If you have any other feedback or concerns, or if this is an urgent matter, please call 1-800-MEDICARE (1-800-633-4227). TTY/TTD users can call 1-877-486-2048, 24 hours a day/7 days a week. You may also visit the Medicare website at


MATERIAL ID: H5430_15_024_MK.
CMS Pending Approval