Mercy Health has adopted a new compensation model for physicians, but some doctors are unwilling to sign the new contracts. Mercy executives report the new pay structure is an effort to standardize compensation for all 2,100 Mercy-employed physicians across the system's four-state operation, including Missouri. But the model also addresses the changes occurring in the health care industry, system officials report. "In this challenging environment we felt a need to look at the compensation model," Donn Sorensen, a regional president at Mercy, said. But some doctors are balking at the changes, saying the new contracts are too restrictive or that pay is based on the quantity of work performed.