The ruling by a federal judge in Texas striking down the Affordable Care Act has injected a powerful wave of uncertainty about recent changes woven into the U.S. health-care system that touch nearly all Americans and the industry that makes up one-sixth of the economy.
The opinion, if upheld on appeal, would upend the health insurance industry, the way doctors and hospitals function, and the ability of millions of Americans to access treatments they need to combat serious diseases.
