Geographic trends in overall and long-acting opioid prescriptions under Medicaid and Medicare Part D in the United States, 2013-2021

Background: Amid the national opioid epidemic, it is important to assess trends in opioid prescriptions. Long-acting opioids (LAOs) are of particular interest as they are among the most intensely misused prescription opioids. Moreover, understanding geographic trends in opioid prescriptions may help identify state-level variations, illustrating state-specific disparities. Objectives: The study aims to determine geographic trends in overall and LAO prescriptions under Medicaid and Medicare Part D from 2013 to 2021. Methods: We used data from the Centers for Medicare & Medicaid Services on opioid prescriptions from 2013 to 2021. The opioid prescribing proportion was calculated as the number of opioid claims divided by the total number of overall drug claims. The LAO prescribing proportion was calculated as number of LAO claims divided by total opioid claims. Results: Despite a general decrease nationwide, Medicaid opioid prescribing proportions increased in Iowa, Montana, and Virginia. There was an increasing trend in the national-level Medicaid LAO prescribing proportion from 2017 to 2021, with a 14.1% point increase (p for the annual percent change [APC]<0.05). For Medicare Part D, the overall prescribing proportions fell by 1.7% points from 2013 to 2021, while the LAO prescribing proportion fell by 3% points from 2016 to 2021 (p for APC < .05). Conclusions: The increasing trends in national-level Medicaid LAO prescribing and Medicaid opioid prescribing in Iowa, Montana, and Virginia are concerning, and have implications for clinical opioid prescribing. The decreasing trends in Medicare Part D may reflect ongoing efforts in opioid prescription management.