Hospitals won’t endorse sweeping federal health care reforms until they are assured that greater numbers of people will be insured and that the costs of broadening coverage don’t cut their budgets too deeply, said Richard Umbdenstock, president and chief executive of the American Hospital Association. Umbdenstock left Spokane several years ago as a senior executive of Providence Health and Services to lead the AHA, which lobbies on behalf of 5,000 U.S. hospitals. He told a crowd gathered Monday at the Spokane Club that the AHA seeks a nonprofit-based insurance option that would cover most of the 50 million uninsured people in the U.S.