It's interesting that they decided to go with InfraGuard for certification rather than CCHIT. My graduate research involves healthcare certification standards (and computer security) but when I asked InfraGuard details about their certification process, they asked me to sign an NDA first (which I wouldn't/couldn't do).
CCHIT is more open, but unfortunately, it's controlled by large vendors in the the healthcare space.
CCHIT is in no way controlled by large healthcare vendors. For example, on the Ambulatory work group only 3 of 11 members work for vendors.
http://www.cchit.org/workgroups/ambulatory
(I am a former member of another CCHIT work group and work for a large healthcare vendor.)
CCHIT is more open, but unfortunately, it's controlled by large vendors in the the healthcare space.