Hospital outpatient imaging can cost more than imaging in freestanding centers - by a lot. An article in Modern Healthcare (here) gives typical outpatient hospital MRI prices as $1500, and freestanding prices as $500, and the delta is much larger in some states.
Anthem has an answer. It isn't steeper discounts when it pays for hospital outpatient imaging. Rather, it's a "blunt instrument." Anthem won't pay for hospital outpatient imaging at all. (See an article in Radiology Business, here, and in Healthcare Dive, here and also here (9/18).)
CMS has also proposed cuts for services at off-campus "hospital" outpatient centers, e.g. satellite physician clinics some distance from the actual hospital, here.
This could be an bad omen for the expansion and profitability of hospital outpatient/outreach labs that bill payers as "hospitals" at much higher prices than freestanding labs can get.