The vast majority of part-time workers in the U.S. don’t have employer-based health insurance, according to a new study from the ADP Research Institute — an issue the health care reform law will help address once it is fully in effect.

The majority of Americans access health insurance through their jobs. But the results from ADP’s study highlight the fact that the current employer-based model often leaves low-wage workers, and particularly those who work fewer than 40 hours a week, in a coverage gap. Only a small percentage of part-time employees are offered health insurance through work, and many of them can’t afford to pay into those plans — but they also typically can’t afford to purchase insurance plans on their own, either.

Fortunately, several Obamacare provisions — including extending Medicaid coverage to additional low-income Americans, providing Americans with subsidies to help them purchase health care on state-based insurance markets, and requiring employers with more than 50 workers to provide health insurance — will start to eliminate some of those coverage gaps and help part-time workers better afford health coverage.

But as Clifford noted, that hasn’t stopped several extremely profitable companies from trying to get around Obamacare and continue denying their workers basic health benefits. Therestaurant industry, which often employs low-wage and part-time workers, has been particularly resistant to Obamacare’s regulation that requires businesses to ensure their employees will be able to afford health care.

h/t: Tara Culp-Ressler at Think Progress Health