There is an extremely simple and potentially bipartisan idea that could dramatically cut the uninsured rate in America: enrolling people automatically in health insurance.

A new study examined the difference in coverage rates among people who were able to automatically reenroll in their Obamacare plan in California and people who were not. They found people without the option to automatically reenroll in an insurance plan were much less likely to stay insured through the marketplace than people with the automatic option. About 30 percent less likely, according to Coleman Drake at the University of Pittsburgh and David Anderson at Duke University who published their study as a research letter in JAMA Internal Medicine.

They framed their findings in the context of the Trump administration’s consideration of ending automatic reenrollment (which is standard on the Obamacare marketplaces). The unavoidable implication is that more people would end up without health insurance. From Drake and Anderson:

Elimination of automatic reenrollment would likely be associated with decreases in the number of enrollees who remain insured through the marketplaces. As an opt-out policy, similar to that used in other health insurance markets such as Medicaid, automatic reenrollment may be associated with increases in continuity of coverage in the marketplaces by reducing administrative barriers to reenrollment.

While the Trump administration considers, for whatever reason, ending a policy that keeps people insured, the truth is automatic enrollment is about the bare minimum the United States could do to make sure its citizens have health coverage.

In the abstract, it’s a no-brainer. It crosses ideological lines. As a group of progressive and conservative health policy experts wrote in Health Affairs last year, automatic enrollment could be one useful way to replace the individual mandate (now repealed) in making sure younger and healthier people sign up for insurance and keep Obamacare premiums down.

Maryland has set one possible example for how automatic enrollment could work, with Republican Gov. Larry Hogan signing a bill this year that allows Marylanders to check a box on their tax return and get enrolled in a health insurance plan. The state estimates half of its 360,000 people are already eligible for either subsidized health insurance or Medicaid through the ACA.

Automatic enrollment is a shared feature of the Democratic health care plans, too. The more moderate proposals, like those by former Vice President Joe Biden and South Bend, Indiana, Mayor Pete Buttigieg, would start by automatically enrolling people who should be eligible for the ACA’s Medicaid expansion but live in a state that refused to expand in a new government insurance plan. Other iterations, like Medicare for America, would automatically enroll newborns in a government plan.

This change would bring some logistical challenges, as Christen Linke Young wrote for the Brookings Institution think tank. Governments have to do the work to figure out what people are eligible for. It might be Medicaid, Obamacare subsidies, or nothing at all, and once they do, governments must also set up a way to collect premiums from the automatically enrolled. A lot of people don’t file federal income taxes, so how do you get them signed up?

There are ways around this. You could include retroactive eligibility so that, even if a person doesn’t get signed up until they end up in the hospital, their recent medical bills are covered. People who support single-payer Medicare-for-all (where every person would have the same government insurance plan) argue this is overly complicated.

But it’s also maybe the easiest way to expand insurance coverage and one that should be agreeable to politicians of both parties.

If Democrats win full control of Congress and the White House next year, then they can think about an even more ambitious health care agenda. Automatic enrollment is something that could be done no matter what. It’s hard to see the argument against it, given what research like that of Drake and Anderson teaches us.

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