Not much if any insurance related issues falls on the rads. The ancillary staff takes care of any insurance pre-approvals and it's really up to the clinician to justify a study, not the radiologist.
There's some but not a ton of non-RVU generating things in radiology, but nothing as bad as the clinical specialties. In a given day I might field a couple of phone calls from tech's that want to double check the right study (aka protocol) is scheduled for a patient coming in or to double check images on a study currently being scanned. I get a handful of calls from clinicians to go over prior studies. At imaging centers, we occasionally have patients getting sedation that need to be talked to prior to the procedure.
I'm just a grunt in a big group; i have very little admin responsibilities. That'll differ depending on size and setting of the group.
The occasional multi-disciplinary conference is the longest, semi-regular thing that keeps me off the list.
The overwhelming majority of most days i'm just reading cases and doing an occasional procedure.