I don't think it really matters what the Optum person told you. The specialty pharmacy bills your AARP prescription plan, which would know about the cap. You just need to make sure Optum has your plan information, because it's not automatic. I am assuming Tymlos is covered by your AARP plan?

Also, it's possible the Optum person is confused and is talking about the first month's bill.

I've spent many hours talking with more than one specialty pharmacy regarding Tymlos, and for sure it is a headache.

P.S. To anyone out there, never, ever, ever use Acaria as your Tymlos pharmacy. I can't stress this enough. I've used CVS and Walgreens, both acceptable.