The House health-care reform bill proposes to decrease hospital visits by establishing a “medical home pilot program” for elderly and disabled Americans. Such a medical home would not require a physician to be on the staff, and therefore could be run solely by nurse practitioners and physician assistants. Medical homes also would practice “evidence-based” medicine, which advocates only the use of medical treatments that are supported by effectiveness research. But physicians’ groups say the legislation could lead to restrictions on which treatments may be used for certain conditions, despite the fact that some patients might require a unique or unconventional...