Health Care's Unlikely Surgeon
New Gingrich, former House speaker, has become broker of ideas and influence in field of health care policy, particularly conservative notion of applying principles of 'ownership society' to medicine through health savings accounts and consumer-directed health care; idea is to give individuals tax breaks to assume responsibility for paying more of their own medical costs and to rely less on government and insurers; believes market forces will bring more options, lower prices and higher quality to health care; another focus of his, one on which he often works with liberals, is to increase investment in health information technology in order to reduce medical errors and improve efficiency; photos (L)
