1. Centers for Medicare & Medicaid Services. Modernizing Part D and Medicare Advantage to lower drug prices and reduce out-of-pocket expense. Fed Regist. 2018;83(231):62152-62201. https://www.federalregister.gov/documents/2018/11/30/2018-25945/modernizing-part-d-and-medicare-advantage-to-lower-drug-prices-and-reduce-out-of-pocket-expenses. Accessed May 1, 2019.
2. Medicare Payment Advisory Commission (MedPAC). Chapter 6: Improving Medicare Part D. In: Report to the Congress: Medicare and the Health Care Delivery System. June 2016. http://www.medpac.gov/docs/default-source/reports/chapter-6-improving-medicare-part-d-june-2016-report-.pdf. Accessed May 1, 2019.
3. Centers for Medicare & Medicaid Services. CMS drug spending: Medicare Part D. https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/Information-on-Prescription-Drugs/index.html. Accessed December 1, 2018.
4. Centers for Medicare & Medicaid Services. Prescription drug plan formulary, pharmacy network, and pricing information files. https://www.cms.gov/research-statistics-data-and-systems/files-for-order/nonidentifiabledatafiles/prescriptiondrugplanformularypharmacynetworkandpricinginformationfiles.html. Accessed May 1, 2019.
5. Health SSR LLC. US prescription brand net pricing data and analysis. https://www.ssrhealth.com/. Accessed May 1, 2019.