Accountable Care Organization

Information for physicians participating in the Pioneer ACO

Any patient who has multiple doctors probably understands the frustration of fragmented and disconnected care: lost or unavailable medical charts, duplicated medical procedures, or the same information shared over and over with different doctors.

Accountable Care Organizations (ACOs) are designed to lift this burden from patients, while improving the partnership between patients and doctors in making health care decisions. Medicare beneficiaries will have better control over their health care, and their doctors can provide better care because they will have improved information about their patients’ medical history and can communicate more readily with a patient’s other doctors.

Many Partners-affiliated primary care physicians are now participating in the Pioneer Accountable Care Organization (ACO), part of a larger national effort being organized by the Centers for Medicare and Medicaid Services (CMS). Your office may be a part of our new ACO, which includes providers affiliated with Brigham and Women's Hospital, Massachusetts General Hospital, Newton-Wellesley Hospital, North Shore Medical Center, Cooley Dickinson Hospital, Emerson Hospital, Hallmark Health System, and Pentucket Medical Associates.

ACOs are groups of doctors, hospitals, and other health care providers, who come together voluntarily to give provide coordinated, high quality care to the Medicare patients they serve. Coordinated care helps ensure that patients, especially the chronically ill, get the right care at the right time, with the goal of avoiding unnecessary duplication of services and preventing medical errors.

Please see the links below for additional information and links to patient forms (patients also have access to these forms on the ACO page in the For Patients section of this website.)

A guide to help physicians and other medical professionals to better understand the ACO program.

A handout for patients to help them better understand what it means to participate in the new ACO program.


A guide to help you and your office answer patient questions and concerns.

The notification letter Medicare beneficiaries received in the mail regarding the ACO. The letter provides general information about ACOs, informs patients that their primary care provider will be part of our ACO, and informs them of their right to opt-out of sharing their Medicare medical claims data with our ACO, if they wish.


Find results from Partners ACO's prior years of performance.


Additional Information

Frequently Asked Questions

Please visit the Centers for Medicare and Medicaid Services

 Please visit the Center for Medicare and Medicaid Innovation

For More Information

For more information, please call the Pioneer ACO Hotline at Partners HealthCare:


or call Medicare at:

1-800-633-4227 (TTY users should call 1-877-486-2048)

Contact the Partners ACO

Partners ACO
115 Fourth Avenue
Needham, MA 02494

Primary Contact:

Dr. Sree Chaguturu


Goal of an ACO

The goal of an ACO is for doctors, hospitals, and other health care providers to work closely together to deliver coordinated, high-quality care.

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