@rjkesal123 I posted a similar question and received answers that I think will be helpful to you. Also, like you I have Original Medicare (Parts A and B) and Supplement G with a Medigap policy.
https://connect.mayoclinic.org/discussion/where-do-you-get-your-evenity-injections/
I have not yet seen the bill but my understanding is that my injections will be paid for, in total, because I get my injections in an infusion center.