From the article:
Medicaid. For those with low incomes and limited assets, Medicaid provides free health insurance. Many states have expanded Medicaid coverage in recent years, so more people are eligible. “This is no longer something that’s just limited to a narrow handful,” says Harry Nelson, a health care attorney and author of “The United States of Opioids: A Prescription for Liberating a Nation in Pain.” In his home state of California, Nelson estimates that about a third of people are covered by Medicaid.