Dr. Hefei Wen, assistant professor in the department of health management and policy at the University of Kentucky College of Public Health, is the lead author of the article “Impact of Medicaid Expansion on Medicaid-covered Utilization of Buprenorphine for Opioid Use Disorder Treatment,” published in the April issue of Medical Care. Co-authors include Dr. Ty Borders, professor of health management and policy at UK College of Public Health.
[Photo: Dr. Hefei Wen (left) and Dr. Ty Borders]
Buprenorphine has been proven effective in treating opioid use disorder. However, the high cost of buprenorphine and the limited prescribing capacity may restrict access to this effective medication-assisted treatment for opioid use disorder.
Dr. Wen et al. examine whether Medicaid expansion and physician prescribing capacity may have impacted buprenorphine utilization covered by Medicaid. They used a quasi-experimental difference-in-differences design to compare the pre-post changes in Medicaid-covered buprenorphine prescriptions and buprenorphine spending between the 26 states that implemented Medicaid expansions under the Affordable Care Act in 2014 and those that did not.
They evaluated all Medicaid enrollees in the expansion states and the non-expansion and late-expansion states. Researchers studied all quarterly Medicaid prescriptions for buprenorphine and spending on buprenorphine from the Centers for Medicare and Medicaid Services Medicaid Drug Utilization files 2011 to 2014.
The authors found that state implementation of Medicaid expansions in 2014 was associated with a 70 percent increase (P<0.05) in Medicaid-covered buprenorphine prescriptions and a 50 percent increase (P<0.05) in buprenorphine spending. Physician prescribing capacity was also associated with increased buprenorphine utilization.
The study concludes that Medicaid expansion has the potential to reduce the financial barriers to buprenorphine utilization and improve access to medication-assisted treatment of opioid use disorder. Active physician participation in the provision of buprenorphine is needed for ensuring that Medicaid expansion achieves its full potential in improving treatment access.