Some abbreviations on your Medicare Part D plan's formulary are for Usage Management Restrictions or to further clarify the coverage details under your particular Medicare Part D prescription drug plan. The abbreviations that you might find on your formulary may include:
PA = Prior Authorization,
PA-NS = Prior Authorization New Starts,
PA-BvsD = Prior Authorization-BvsD Only (Part D vs. Part B Prior Authorization Only),
QL = Quantity Limits,
ST = Step Therapy,
ST-NS = Step Therapy New Starts,
LA = Limited Access,
MS = Mail Service Available