Seems so crazy that there are so many variations in how treatments are covered and paid for. I also have traditional Medicare and a Part D drug plan plus a Medicare supplemental insurance plan. Since my Evenity shots are administered at a hospital infusion center, not a doctor's office, once per month, Medicare negotiates and pays a certain lessor portion of the total cost, and then my supplemental insurance plan pays the remaining 20% of that negotiated cost. The Part D insurance doesn't come into play at all.