Morgan JR, Quinn EK, Chaisson CE, et al. - For individuals desiring medications for opioid use disorder (MOUD), filling a written prescription is the final step in the cascade of care for opioid use disorder (OUD). Researchers sought to report on the fill rates within 30 days as reported in claims data. Data from a large de-identified database linking individuals' electronic medical records (EMR) and administrative claims data were used and a previously developed algorithm was employed to identify individuals with a new diagnosis of OUD. There were only 70% of new prescriptions for medications for opioid use disorder that were filled within 30 days. A 75% fill rate at 30 days was reported among individuals with prescription copay at or below the mean relative to 63% for those with copay above the mean and this difference was consistent across fill times.