The U.S. Department of Health & Human Services this morning announced 106 new accountable care organizations, which now rack up to more than 250 since the Affordable Care Act passed.

"As many as 4 million Medicare beneficiaries now have access to high-quality, coordinated care across the United States," HHS Secretary Kathleen Sebelius said today.

If the ACOs meet the 33 quality measures of care coordination, patient safety and preventative health, they could realize savings of up to $940 million over four years, HHS said.

The newly launched ACOs, which started Jan. 1, build the ACO presence in certain states. Adding on to the 2012 cohorts, ACOs mainly concentrate in Florida, Massachusetts and California. However, this batch boosts an ACO presence in Georgia and Connecticut and adds Puerto Rico to the mix.

Fifteen of this cohort are Advance Payment Model ACOs, led by physician-based or rural providers, who are investing in health IT and infrastructure for faster savings.

HHS also released a report that Medicare spending has slowed from 2010 to 2012 to historic lows and suggested the ACA provisions are working. Medicare spending per beneficiary will be on pace with the growth of the economy, according to the report.

To see the full list of 106 ACOs click here.