Yes, they do this now commonly.
The Tier function has been around for about a decade now on many drug therapies.
It also has been in place for blood pressure medications, and I would expect it to be in place for the biological treatments like IVIG, Humira, etc.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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