The coronavirus pandemic is the best argument for “Medicare for All.” As it stands, most Americans get health care only if we have insurance that will pay for it. If we don’t or we can’t afford the deductibles and copayments, too bad. Every other advanced country provides universal health care in a predominately nonprofit system.

What happens, then, when Americans develop a fever and cough? Are they likely to seek medical help, despite the hefty bills they are sure to receive, particularly if, say, the radiologist is out of network or the insurance company refuses to pay for some other reason? The new coronavirus, while highly contagious, is usually mild, so people with minimal symptoms might simply take their usual cold remedies while they go about their business and spread the infection widely.

The problem is that we treat health care like a market commodity distributed according to the ability to pay in an uncoordinated system with hundreds of commercial insurers and profit-oriented providers. Some 30 million people have no access to health care because they are uninsured, and millions more don’t use their insurance because the deductibles and copayments are unaffordable. In addition, insurers usually require patients to get their care within a narrow network of providers and exclude certain services.

Marcia Angell is a member of Harvard Medical School’s Department of Global Health and Social Medicine, and a former editor-in-chief of the New England Journal of Medicine. She will soon be a resident of Santa Fe.