Massachusetts Gov. Deval Patrick just exhorted legislators to overhaul the way the state pays for health care. He’s pushing for an end to the traditional arrangement of compensating doctors and hospitals for each service they provide. It’s not yet clear what will replace this “fee-for-service” payment system. But there’s growing support for a “global budget” model, under which primary care physicians would receive annual lump sums for each of their patients - regardless of how little or how much care they needed.