<human>: Could you distill the essence of the text into 1-3 sentences?

So, I recently saw a surgeon at Virginia Mason who ordered a CT scan. My insurance deductible (Group Health) is all paid up and no one mentioned getting pre-authorization for this. I went to my insurance's website a few days later and noticed claims totaling 3500 that had been denied due to no pre-authorization being sought. 

After a few calls to VM and GH, Group Health noted that the "patient responsibility" line is $0 and my doctor was supposed to seek pre-authorization, therefore making the treatment a "provider write-off". I haven't received a bill from VM for the CT scan yet, but am concerned that  they might pass on this cost to me. I am unsure whether I signed a contact (along with my consent to treatment) making me financially responsible for the treatment. 

I know that I've made some mistakes here by not being more careful, but a series of tests were ordered very quickly and I am pretty new to being insured on my own. 

I'm basically wondering what the provider's (VM's) standard operating procedure will be. Will they dispute this with GH or come after me? Does anyone have experience in this area? I'm told that I can be billed at any time during the next 18 months. 

I'm also wondering about next steps - should I wait for a bill or make further contact with VM about it? I don't want to invite them to bill me in any way, since this appears to be a dispute between two (wealthy) giants.
<bot>: Health insurance claim denied because not pre-authorized, insurance says that the provider should write it off, worried they'll come after me.