By Pat Anson, PNN Editor

The expansion of Medicaid under the Affordable Care Act – widely known as Obamacare -- was associated with a six percent lower rate of opioid overdose deaths, according to a new study that estimates thousands of overdoses may have been prevented by expanding access to healthcare for millions of Americans.

Researchers also found a significant and unexpected increase in overdoses involving methadone, an addiction treatment drug sometimes used to treat chronic pain.

Thirty-two states and the District of Columbia opted to expand Medicaid eligibility under the Affordable Care Act (ACA), providing healthcare coverage to uninsured low-income adults. ACA requires that individuals who receive coverage be provided with mental health and substance use disorder treatment.

Researchers at the NYU Grossman School of Medicine and University of California, Davis looked at death certificate data from 49 states and the District of Columbia between 2001 and 2017— looking for changes in overdose rates in counties that expanded Medicaid under ACA compared to those that did not.

Their findings, published online in JAMA Network Open, suggest that Medicaid expansion prevented between 1,678 and 8,132 opioid overdose deaths from 2015 to 2017.

Overall, there was a 6% lower rate of opioid overdose deaths, an 11% lower rate of heroin overdoses, and a 10% lower rate of death involving fentanyl and synthetic opioids other than methadone in states that adopted the ACA.

"The findings of this study suggest that providing expanded access to health care may be a key policy lever to address the opioid overdose crisis," said senior author Magdalena Cerdá, DrPH, director of the Center for Opioid Epidemiology and Policy in the Department of Population Health at NYU Langone Health.

Methadone Overdoses Rose

Cerdá and her colleagues also found a concerning 11% increase in methadone overdose rates in states that expanded Medicaid under the ACA. Methadone is an opioid that has long been used to treat addiction, but it is also prescribed by some doctors to treat chronic pain.

“Although the rate of methadone-related mortality is relatively low compared with other opioid classes, our finding that Medicaid expansion was associated with increased methadone overdose deaths deserves further investigation,” researchers said.

“Past research has found high rates of methadone use to treat pain among Medicaid beneficiaries and that the drug is disproportionately associated with overdose deaths among individuals in this population, underscoring the importance of ongoing local, state, and federal actions to address safety concerns associated with methadone for pain in tandem with Medicaid expansion.”

In 2014, the methadone prescribing rate among Medicaid patients was nearly twice that of commercially insured patients. Medicaid patients were also slightly more likely to be prescribed methadone for pain (1.1% vs. 0.85%) as opposed to addiction.

Expansion Reduced Opioid Deaths

The ACA became law at a time when opioid overdose deaths were rising sharply. Some critics of Obamacare claimed that expanding access to low-cost opioid pain relievers would create an incentive for low-income Medicaid beneficiaries to sell their drugs.

“It stands to reason that expanding the program — particularly to people most susceptible to abuse — could worsen the problem,” a 2018 report by Sen. Ron Johnson (R-WI) claimed. “The epidemic has indeed spiraled into a national crisis since the Obamacare Medicaid expansion took effect in 2014. Drug overdose deaths have risen rapidly, at a much faster pace than before expansion.”

The NYU and UC Davis study found that theory to be false.

"Past research has found Medicaid expansion is associated with not only large decreases in the number of uninsured Americans, but also considerable increases in access to opioid use disorder treatment and the opioid overdose reversal medication naloxone," said lead author Nicole Kravitz-Wirtz, PhD, an assistant professor in the Department of Emergency Medicine at UC Davis.

"Ours was the first study to investigate the natural follow-up question: Is the expansion associated with reductions in local opioid overdose deaths? On balance, the answer appears to be yes."