Tuesday, April 22, 2014 Blum Resigns From CMS Jonathan Blum, principal deputy administrator for the US Center for Medicare and Medicaid Services (CMS), has resigned his position effective May 16, according to an alert from Modern Healthcare (access via free signup). Blum was the Obama administration's first appointee to CMS, and he led the development of regulations for accountable care organizations (ACOs) as well as "developing many … value-based payment strategies," according to an e-mail from CMS Administrator Mary Tavenner announcing Blum's resignation. Most recently, Blum oversaw the release of extensive Medicare payment data for 880,000 health care providers. At the time of this writing, details behind Blum's resignation were not available. In her e-mail Tavenner cited "new opportunities" as the reason for his departure.