Same here at first, when ordering as DME supplier. But last year my insurance started coverage via pharmacy or dme. Pharma is more convenient, lower cost and can be ordered locally as needed.
Check your insurance formulary for dexcom. If no G6, it may switch for G7 since there is no “durable” (DME) part, once G7 is covered.
Addition:
Assuming a G7 receiver is available and purchased for Medicare coverage, the G7 receiver will be the durable part, which is similar to G6. Sorry for confusion. Will know for sure once Dexcom posts on their website and Medicare formally documents criteria for coverage for G7.