Jin,
As you may know, some people have had their 2 level ADRs covered by their insurance:
https://www.adrsupport.org/forums/sh...aetna+approval
Granted, they had out of network coverage; but this is a precedent.
Did you use the search function to identify all the Aetna-related topics?
BTW, cervical fusion is not a bad solution. I know many folks that had these YEARS ago and still doing well.