Hospital boardrooms are beginning to sound more like those on Wall Street, with talk of upside and downside risk, capitation and a hefty addition of new acronyms.Hospitals, health systems and physician groups are now in the process of deciding which of the two possible reimbursement paths they will take under the Medicare Access and CHIP Reauthorization Act, which replaced the rarely implemented sustainable growth-rate formula for determining physician pay.“This is not practice as usual,” said Aric Sharp, vice president of accountable care at UnityPoint Health, based in West Des Moines, Iowa. “This is not what we've done for the past 10 to 20 years in group practice. This is a whole new world.”