This year my insurance switched their PBM, and I learned new PBM (ExpressScripts) covers dexcom as pharmacy benefit. Service is better/more convenient, AND lower cost. I conveniently get my order in one day from Costco.
Following link is for dexcom site where you can check if your insurance covers as pharmacy.
In first portion, enter your zip code:
Find out which plans in your area include Dexcom G6.*
Search by ZIP code or NPI number.
The results will indicate pharmacy or medical (DME).