The Centers for Medicare and Medicaid Services (CMS) announced the providers participating two new ACO models, the Next Generation ACO and the ACO Investment Model (AIM).

Announced in March 2015, the Next Generation ACO is designed for existing or new ACOs who are able to take on significantly higher risk than previously available. The model will also allow for greater shared savings opportunity, and tests the assumption that with more financial upside it will attract providers that are experienced in coordinating managing risk. CMS said at the time that the new model “sets predictable financial targets, enables providers and beneficiaries greater opportunities to coordinate care, and aims to attain the highest quality standards of care.”

There are 21 Next Generation ACOs. A list can be downloaded here.

CMS said the ACO Investment Model includes two 2015 starts and 39 starts for 2016. AIM covers 394,000 beneficiaries nationwide. AIM is intended to meet the needs of rural and underserved beneficiaries where startup costs were previously prohibitive. CMS said that of the 39 newly accepted participants, 31 have at least 65% of their delivery sites in rural areas, and 23 have 85% or more of their delivery sites in rural areas. AIM participants receive either an upfront payment or monthly ongoing payments. A list can be downloaded here.

Currently, there are 397 Shared Savings Program ACOs, the most common Medicare accountable care organization model. Of those, 35 ACOs are designated Advance Payment Model ACOs—organizations that received up-front financial assistance similar to AIM.

Ten Pioneer ACOs remain from the original 32 that started in 2012. The Bellin-Thedacare Pioneer ACO partnership dissolved and each system entered the Next Generation program as separate entities. OSF Healthcare, Park Nicollet and Trinity Health also transitioned to the new model.

Brown & Toland, Dartmouth Hitchcock and Heritage California appear to have exited the program entirely, at least for now.


Allina Health, Minneapolis, MN
Atrius Health, Newton, MA
Banner Health Network, Mesa, AZ
Beth Israel Deaconess Care Organization, Westwood, MA
Fairview Health Services, Minneapolis, MN
Michigan Pioneer ACO, Southfield, MI
Monarch HealthCare ACO, Irvine, CA
Montefiore ACO, New York, NY
Park Nicollet Health Services, St. Louis Park, MN
Partners Community Healthcare, Needham, MA

Updated January 17, 2016

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