As the OP already noted, health price inflation is in line with inflation in the rest of the economy. Health care prices have been rising almost unprecedentedly slowly (prices for physician and clinical services have actually been dropping lately).
The reason spending jumped in 2014 is that we as a nation started buying more services--as others earlier in the thread noted, more sick people are getting the care they need now. That jump was expected (and intended) as millions of people gained coverage; it'll continue until the coverage gains taper off and the insurance rate stabilizes, at which point that new utilization will be baked into the baseline and it won't drive growth anymore.
Anyway, the point was the projections were substantially more pessimistic than the reality across the board.