Disclaimer: I don't know what I'm talking about.
I would think if you told them you wanted the cash pay price, you should be able to get it done easily on your own dime. You have to pay it in full, upfront. That's what a friend does when he doesn't want to run stuff (like a colonoscopy) through his insurance ... because when he mentions insurance, the amount he ends up paying towards the deductible is much higher than the cash price without insurance. It might work for a second opinion.
Reread Disclaimer at the top
Oct-2009 Stage I CC
Jun-2016 Stage 3 (T3 N1c)
Jul-2016 PET: Probable Stage 4 with inoperable lung mets
Jan-2017 Dropped oxaliplatin, continuing with 5FU, added Avastin
Aug-2017 Dropped Avastin, continuing with 5FU
Dec-2017 Chemo stopped working, lung mets growing but CEA stable, considering other treatment options
Jan-2018 Begin Folfiri & Cyramza (ramucirumab); also receiving Vitamin C & Quercetin by IV every week
Jun-2018 Taking a chemo break; preparing for surgery