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Data on prescription drug spending was obtained from the Center for Medicare and Medicaid Services.

Spending numbers were available for Medicare Part D, Medicare Part B and Medicaid, for years 2012-2016.

The original data for all three programs can be viewed on's online dashboard, or downloaded from there as an Excel file. The original, unmodified files are also in the data/raw-files directory of this repo.

For each program, the annual spending on individual MS drugs was compared against total spending program wide. For Medicare Part D and Medicaid, the average year-over-year spending growth for each drug (and the aggregate for all drugs) was calculated, and the annual spending, per patient, of each MS drug was visualized.
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