This is a parallel, cluster randomized controlled trial in which medical practices with clinicians who prescribed adalimumab (Humira) to patients in a Humana Medicare Prescription Drug Plan (PDP) will be randomized to have eligible clinicians within the practice invited to participate in the educational module about biosimilars (the intervention group). Practices with eligible physicians that are not offered the educational module will serve as the comparison group (the control group). The study will include practices in all 50 US states and Washington, DC, and practices will be stratified into approximately 50 geographic regions. Regions containing about half of the eligible clinicians will have the module offered to the intervention group in-person and the other half of regions will have the module offered virtually. Practices will be randomized 2:1 to be offered detailing (intervention) vs. not be offered detailing (control). Outcomes, including the use and cost of biologics and biosimilars, will be measured from routinely-collected prescribing data using the Humana Research Database.
