We've heard it time and time again: Heathcare costs are on the rise. However, a recent study conducted by the Health Research Institute found medical cost trends for employer-sponsored plans aren't rising at the same pace. In fact, they predict that in 2017 the medical cost trend will be the same as 2016. HRI measured the spending growth for 155 million Americans who are covered by employer-based health insurance and found that the forces inflating medical cost trends are ones you can probably…