During the year, a Part D plan may make changes to it formulary — dropping some from coverage or adding some it hasn’t covered before — according to Medicare regulations. If the change involves a drug you’re currently taking, the plan must take one of two actions:
Send you a written notice at least 60 days before the change takes effect; or
At the time you request a refill, notify you of the change in writing and provide a 60-day supply of the drug under the same terms as before.
However, if the plan has ceased to cover your drug because of a safety issue — for example, the national recall of a drug that has proved harmful in some way — the plan is not required to inform you.