I was diagnosed with lumber spinal stenosis this past summer. My spine doc, who is a keen cyclist

, said my 2015 Cannondale SuperSix EVO carbon did not offer as comfortable a ride as my back needed so he suggested I sell it and get a nicer bike. I took his advice and picked up a 2014 demo bike, a Cannondale SuperSix EVO
Hi-Mod Team bike.
Way more comfortable than the 2015.
He said a so-called comfort bike (sitting upright, hybrid) was the exact opposite of what I needed. Riding leaned over on my road bikes stretches out my spine and relaxes the "squeezing" of my nerves in my lower back.

Here's my doctor-recommended "comfort bike".