The coronavirus pandemic has forced the nation’s doctors and hospitals to reevaluate how they work. At least three major changes may have a lasting impact.

The U.S. health care system is famously resistant to government-imposed change. It took decades to create Medicare and Medicaid, mostly due to opposition from the medical-industrial complex. Then it was nearly another half-century before the passage of the Affordable Care Act.

But the COVID-19 pandemic has done what no president or social movement or venture capitalist could have dreamed of: It forced sudden major changes to the nation’s health care system that are unlikely to be reversed.

“Health care is never going back to the way it was before,” said Gail Wilensky, a health economist who ran the Medicare and Medicaid programs for President George H.W. Bush in the early 1990s.

Wilensky is far from the only longtime observer of the American health care system to marvel at the speed of some long-sought changes. But experts warn that the breakthroughs may not all make the health system work better, or make it less expensive.

That said, here are three trends that seem likely to continue.