The number of accountable care organizations is increasing and they are saving Medicare more money, according to a CMS release, but providers say the average savings per ACO declined, and they offered a tepid response to results from ACO performance in 2014 that CMS released Tuesday (Aug. 25). Nevertheless, the results indicate ACOs that reduced Medicare spending in 2013 also reduced spending in 2014, which suggests that the results aren't random, and researchers are trying to identify what successful ACOs...