Where Do the Full Cost of Drug Prices on Medicare.gov Comes From?

When viewing the Plan Results for prescription drug plans on the Medicare.gov plan finder tool, a list of plans is displayed. When a plan is selected, and the "Drug Costs & Coverage" tab is selected, there is a section titled "What you Pay." This section includes the selected drugs, the "Full Cost of Drug", Refill Frequency, Initial Coverage Level, Coverage Gap, and Catastrophic coverage amounts for the selected plan. If I then choose a different plan with the same pharmacy and view the "What You Pay" section, the Full Cost of Drug amounts are different. I have even found different branches of

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